Risa's salary is 80% less than Tiffany's salary. When their salaries are decreased by 10%, their combined salaries will be $2430. How much was Tiffany's salary before the decrease?
| |
Risa |
Tiffany |
Total |
| Before |
1 u |
5 u |
6 u |
| Change |
- ? |
- ? |
- 0.6 u |
| After |
? |
? |
5.4 u
$2430 |
100% - 80% = 20%
RisaTiffany =
20100 =
15 Combined salaries at first
= 1 u + 5 u
= 6 u
Decrease in the combined salaries
= 10% x 6 u
=
10100 x 6 u
= 0.6 u
Combined salaries in the end
= 6 u + 0.6 u
= 5.4 u
5.4 u = 2430
1 u = 2430 ÷ 5.4 = 450
Tiffany's salary before the decrease
= 5 u
= 5 x 450
= $2250
Answer: $2250
