PSLE Andy was given a fixed amount of allowance each month. In January, he saved $390 and spent the rest. In February, he saved 20% more and his spending decreased by 40%. How much was Andy's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 20% |
- 40 u |
After |
120% |
60 u |
100% of savings = 390
1% of savings = 390 ÷ 100 = 3.9
20% of savings = 20% x 390 = 78
20% of savings = 40 u of spending
40 u of spending = 78
1 u of spending = 78 ÷ 40 = 1.95
100 u of spending = 100 x 1.95 = 195
Andy's allowance for each month
= 100% of savings + 100 u of spending
= 390 + 195
= $585
Answer(s): $585