Answer:
Step-by-step explanation:
You want the percentage multiplier associated with the following changes:
To find the multiplier, add 1 to the change. When you want the multiplier in percent, then add 100% to the change expressed as a percent. (1 = 100%)
100% -25% = 75% . . . . of last year
100% +50% = 150% . . . . of sales last month
100% -10% = 90% . . . . of last marathon's time