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I can see the image you provided. Let's go through the questions and solve them step by step.

### **Question 1**: Increase by the given percentage
We will increase each value by the given percentage.

a. \( 90 \times (1 + 10\%) = 90 \times 1.1 = 99 \)  
b. \( 72 \times (1 + 60\%) = 72 \times 1.6 = 115.2 \)  
c. \( 450 \times (1 + 50\%) = 450 \times 1.5 = 675 \)  
d. \( 800 \times (1 + 30\%) = 800 \times 1.3 = 1040 \)  
e. \( 600 \times (1 + 70\%) = 600 \times 1.7 = 1020 \)  
f. \( 56 \times (1 + 80\%) = 56 \times 1.8 = 100.8 \)  
g. \( 500 \times (1 + 20\%) = 500 \times 1.2 = 600 \)  
h. \( 850 \times (1 + 40\%) = 850 \times 1.4 = 1190 \)  
i. \( 620 \times (1 + 100\%) = 620 \times 2 = 1240 \)  
j. \( 60 \times (1 + 90\%) = 60 \times 1.9 = 114 \)  
k. \( 840 \times (1 + 15\%) = 840 \times 1.15 = 966 \)  
l. \( 870 \times (1 + 65\%) = 870 \times 1.65 = 1435.5 \)  

### **Question 2**: Decrease by the given percentage
Next, we decrease the values by the given percentages.

a. \( 285 \times (1 - 20\%) = 285 \times 0.8 = 228 \)  
b. \( 96 \times (1 - 20\%) = 96 \times 0.8 = 76.8 \)  
c. \( 16 \times (1 - 10\%) = 16 \times 0.9 = 14.4 \)  
d. \( 580 \times (1 - 80\%) = 580 \times 0.2 = 116 \)  
e. \( 930 \times (1 - 60\%) = 930 \times 0.4 = 372 \)  
f. \( 4864 \times (1 - 35\%) = 4864 \times 0.65 = 3161.6 \)  
g. \( 235 \times (1 - 70\%) = 235 \times 0.3 = 70.5 \)  
h. \( 1525 \times (1 - 85\%) = 1525 \times 0.15 = 228.75 \)  
i. \( 680.5 \times (1 - 5\%) = 680.5 \times 0.95 = 646.475 \)  
j. \( 550 \times (1 - 90\%) = 550 \times 0.1 = 55 \)  
k. \( 240 \times (1 - 30\%) = 240 \times 0.7 = 168 \)  
l. \( 660 \times (1 - 40\%) = 660 \times 0.6 = 396 \)  

### **Question 3**: Find the answers to the following
For this section, we perform various percentage calculations.

a. \( 300 \times (1 + 10\%) = 300 \times 1.1 = 330 \)  
b. \( 1500 \times (1 + 20\%) = 1500 \times 1.2 = 1800 \)  
c. \( 550 \times (1 - 20\%) = 550 \times 0.8 = 440 \)  
d. \( 240 \times (1 - 25\%) = 240 \times 0.75 = 180 \)  
e. \( 28 \times (1 - 25\%) = 28 \times 0.75 = 21 \)  
f. \( 600 \times (1 - 15\%) = 600 \times 0.85 = 510 \)  
g. \( 860 \times (1 + 30\%) = 860 \times 1.3 = 1118 \)  
h. \( 800 \times (1 + 30\%) = 800 \times 1.3 = 1040 \)  
i. \( 1024 \times (1 + 40\%) = 1024 \times 1.4 = 1433.6 \)  
j. \( 2000 \times (1 - 24\%) = 2000 \times 0.76 = 1520 \)  
k. \( 230 \times (1 - 5\%) = 230 \times 0.95 = 218.5 \)  
l. \( 2500 \times (1 + 25\%) = 2500 \times 1.25 = 3125 \)  

### **Question 4**: Find the new value of the car
The price of the car decreases by 20% after one year.

a. \( 36000 \times (1 - 20\%) = 36000 \times 0.8 = 28800 \)

For the simple interest questions, we use the formula for simple interest:  
\[ I = P \times r \times t \]

b. \( I = 2500 \times 12\% \times 1 = 2500 \times 0.12 = 300 \)  
c. \( I = 36000 \times 8\% \times 2 = 36000 \times 0.08 \times 2 = 5760 \)  
d. \( I = 6540 \times 10\% \times 5 = 6540 \times 0.1 \times 5 = 3270 \)

Would you like further clarification or a breakdown of any specific section?

Here are five follow-up questions to expand on the material:
1. How do we calculate percentage increases and decreases for values?
2. What is the formula for simple interest, and how can it be applied in different situations?
3. What is the effect of compounding versus simple interest in financial calculations?
4. How would the results change if we compounded the interest annually instead of using simple interest?
5. How can percentage changes be used to compare the growth rates of different quantities?

**Tip**: Always double-check percentage calculations by ensuring the decimal is properly placed before multiplying.

Solve various percentage increase, decrease, and simple interest problems as shown in the provided worksheet.

Solve percentage increase and decrease problems, and calculate simple interest with step-by-step solutions. Ideal for students in Grades 6-8 learning about percentages and financial mathematics.

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