PSLE Riordan was given a fixed amount of allowance each month. In June, he saved $480 and spent the rest. In July, he saved 20% more and his spending decreased by 30%. How much was Riordan's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 20% |
- 30 u |
After |
120% |
70 u |
100% of savings = 480
1% of savings = 480 ÷ 100 = 4.8
20% of savings = 20% x 480 = 96
20% of savings = 30 u of spending
30 u of spending = 96
1 u of spending = 96 ÷ 30 = 3.2
100 u of spending = 100 x 3.2 = 320
Riordan's allowance for each month
= 100% of savings + 100 u of spending
= 480 + 320
= $800
Answer(s): $800