Mr. mathewson increased the amount of weight he lifted each morning from 80 pounds to 90 pounds. by what percentage did mr. mathewson increase the amount of weight he lifted?

Mr. Mathewson increased the amount of weight he lifted by 12.5%

Step-by-step explanation:

90 = 80 + x% × 80

When you increase an amount A by x%, that means you find x% of A, and add it to A. By the way, the percentage decrease to get back to A is _always_ different.

90 - 80 = (80 + x% × 80) - 80

10 = x% × 80

x% = 10÷80

% means divide by 100 (per means divide, cent means 100)

(x÷100) × 100 = (10÷80) × 100

x = 1000 ÷ 80

= 100 ÷ 8

= 25 ÷ 2 = 12.5

x% = 12.5%

Check: 12.5% of 80 is 0.125 × 80 = 10

You might recognize 0.125 as 1/8.

To increase 80 by 12.5% you add

12.5% of 80 to 80, giving 90. ✔

the probability is 0

b is the answer that makes most sense

step-by-step explanation: