Question

1. 100 increased by 99%
2. 75 decreased by 80%

Answer 1

1. 199

2. 15

Explanation:

1. To increase a number by a certain amount, you multiply the number by 0.99 and add it to the original number:

100(0.99)=99

100+99= 199

2. To decrease a number by a certain amount, you can multiply the number by 0.80 then subtract it from the original number:

75(0.80)= 60

75-60= 15