Verify Math Problems on Percentage Change, Tax or Interest

Determine each number. Round to the nearest tenth if necessary.
1. What number is 25% of 280 70
2. 28 is what percent of 50 76%

Determine each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or a decrease.
3. 500 albums to 100 albums -80%
4. 350 yards to 420 yards 20%

Determine the total cost to the nearest cent.
5. $105 skateboard; 7 1/2% tax $112.88 = $112.90
6. $12,500 car; 3 3/4% tax $12,968.75 = $12,969
7. @210 watch; 20% discount $168
8. $6 notebook; 50 off, 7% tax $3.21 = $3.20

Determine the simple interest paid to the nearest cent.
9. $12,000, 4 1/2%, 40 months $944.94 = $944.90
10. $750, 18%, 2 years $148.63 = $148.60

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Description I have completed the problems but they need to verified for accuracy. Please provide step-by-step instructions for solving the problems.

Determine each number. Round to the nearest tenth if necessary.

1. What number is 25% of 280? 70
2. 38 is what percent of 50? 76%

Determine each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or a decrease.

3. 500 albums to 100 albums -80%
4. 350 yards to 420 yards 20%

Determine the total cost to the nearest cent.

5. $105 skateboard; 7 1/2% tax $112.88 = $112.90
6. $12,000 car; 3 3/4% tax $12,968.75 = $12, 969
7. $210 watch; 20% discount $168
8. $6 notebook; 50% off; 7% tax $3.21 = $3.20

Determine the simple interest paid to the nearest cent.

9. $12,000, 4 1/2% 40 months $$944.94 = $944,90
10. $750, 18%, 2 years $148.63 = $148.60

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To help me better understand how to solve the problems noted below, please provide step by step instructions on how to solve the problems. Thank you for your help.

Determine each number. Round to the nearest tenth if necessary.

1. What number is 25% of 280? 70
2. 38 is what percent of 50? 76%

Determine each percent of change. Round to the nearest whole percent if necessary. State whether the percent of change is an increase or a decrease.

3. 500 albums to 100 albums -80%
4. 350 yards to 420 yards 20%

Determine the total cost to the nearest cent.

5. $105 skateboard; 7 1/2% tax $112.88 = $112.90
6. $12,500 car, 3 3/4 % tax $12,968,75 = $12, 969

7. $210 watch, 20% discount $168
8. $6 notebook; 50% off; 7% tax $3.21 = $3.20

Determine the simple interest paid to the nearest cent.
9. $12,000, 4 1/2%, 40 months $944.94 = $944.90
10. $750, 18%, 2 years $148.63 = $148.60