PSLE Riordan was given a fixed amount of allowance each month. In January, he saved $330 and spent the rest. In February, he saved 40% more and his spending decreased by 10%. How much was Riordan's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 40% |
- 10 u |
After |
140% |
90 u |
100% of savings = 330
1% of savings = 330 ÷ 100 = 3.3
40% of savings = 40% x 330 = 132
40% of savings = 10 u of spending
10 u of spending = 132
1 u of spending = 132 ÷ 10 = 13.2
100 u of spending = 100 x 13.2 = 1320
Riordan's allowance for each month
= 100% of savings + 100 u of spending
= 330 + 1320
= $1650
Answer(s): $1650