PSLE Harry was given a fixed amount of allowance each month. In November, he saved $420 and spent the rest. In December, he saved 30% more and his spending decreased by 10%. How much was Harry's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 30% |
- 10 u |
After |
130% |
90 u |
100% of savings = 420
1% of savings = 420 ÷ 100 = 4.2
30% of savings = 30% x 420 = 126
30% of savings = 10 u of spending
10 u of spending = 126
1 u of spending = 126 ÷ 10 = 12.6
100 u of spending = 100 x 12.6 = 1260
Harry's allowance for each month
= 100% of savings + 100 u of spending
= 420 + 1260
= $1680
Answer(s): $1680