Selina and three of her classmates each wrote out the steps for finding an approximate percent change. They all agreed on the first and fourth step: 1. Find the positive difference between the original number and the new number.2. ________________________3. ________________________4. Round the answer if necessary.They did not agree on steps 2 and 3. Which instructions are correct for steps 2 and 3?
Answer
A
2. Divide the difference by the original number.3. Multiply the quotient by 100 to change it from a decimal to a percent.
B
2. Divide the difference by the new number.3. Multiply the quotient by 100 to change it from a decimal to a percent.
C
2. Divide the difference by the original number.3. Multiply the quotient by 10 to change it from a decimal to a percent.
D
2. Divide the difference by the new number.3. Multiply the quotient by 10 to change it from a decimal to a percent.
Explanation
To find percent change, divide the positive difference by the original number to determine how large the change is relative to the starting amount. Then multiply the quotient by 100 to convert the decimal to a percent. So the correct instructions are to divide by the original number and multiply by 100: choice A.
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