PSLE Zeph was given a fixed amount of allowance each month. In November, he saved $150 and spent the rest. In December, he saved 30% more and his spending decreased by 20%. How much was Zeph's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 30% |
- 20 u |
After |
130% |
80 u |
100% of savings = 150
1% of savings = 150 ÷ 100 = 1.5
30% of savings = 30% x 150 = 45
30% of savings = 20 u of spending
20 u of spending = 45
1 u of spending = 45 ÷ 20 = 2.25
100 u of spending = 100 x 2.25 = 225
Zeph's allowance for each month
= 100% of savings + 100 u of spending
= 150 + 225
= $375
Answer(s): $375