PSLE Valen was given a fixed amount of allowance each month. In November, he saved $90 and spent the rest. In December, he saved 40% more and his spending decreased by 10%. How much was Valen's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 40% |
- 10 u |
After |
140% |
90 u |
100% of savings = 90
1% of savings = 90 ÷ 100 = 0.9
40% of savings = 40% x 90 = 36
40% of savings = 10 u of spending
10 u of spending = 36
1 u of spending = 36 ÷ 10 = 3.6
100 u of spending = 100 x 3.6 = 360
Valen's allowance for each month
= 100% of savings + 100 u of spending
= 90 + 360
= $450
Answer(s): $450