Tiffany's salary is 10% more than Zoe's salary. When their salaries are increased by 40%, their combined salaries will be $11172. How much was Tiffany's salary before the increase?
| |
Tiffany |
Zoe |
Total |
| Before |
11 u |
10 u |
21 u |
| Change |
+ ? |
+ ? |
+ 8.4 u |
| After |
? |
? |
29.4 u
$11172 |
100% + 10% = 110%
TiffanyZoe =
110100 =
1110 Combined salaries at first
= 11 u + 10 u
= 21 u
Increase in the combined salaries
= 40% x 21 u
=
40100 x 21 u
= 8.4 u
Combined salaries in the end
= 21 u + 8.4 u
= 29.4 u
29.4 u = 11172
1 u = 11172 ÷ 29.4 = 380
Tiffany's salary before the increase
= 11 u
= 11 x 380
= $4180
Answer: $4180
