Sarah's salary is 10% more than Penelope's salary. When their salaries are increased by 70%, their combined salaries will be $10710. How much was Sarah's salary before the increase?
| |
Sarah |
Penelope |
Total |
| Before |
11 u |
10 u |
21 u |
| Change |
+ ? |
+ ? |
+ 14.7 u |
| After |
? |
? |
35.7 u
$10710 |
100% + 10% = 110%
SarahPenelope =
110100 =
1110 Combined salaries at first
= 11 u + 10 u
= 21 u
Increase in the combined salaries
= 70% x 21 u
=
70100 x 21 u
= 14.7 u
Combined salaries in the end
= 21 u + 14.7 u
= 35.7 u
35.7 u = 10710
1 u = 10710 ÷ 35.7 = 300
Sarah's salary before the increase
= 11 u
= 11 x 300
= $3300
Answer: $3300
