Answer:
1. 199
2. 15
Step-by-step 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
