PSLE Harry was given a fixed amount of allowance each month. In September, he spent $30 and saved the rest. In October, he spent 40% less and his savings increased by 30%. How much was Harry's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $30 |
100 u
|
Change |
- 40% |
+ 30 u |
After |
60% |
130 u |
100% of spending = 30
1% of spending = 30 ÷ 100 = 0.3
40% of spending = 40% x 30 = 12
40% of spending = 30 u of savings
30 u of savings = 12
1 u of savings = 12 ÷ 30 = 0.4
100 u of savings = 100 x 0.4 = 40
Harry's allowance for each month
= 100% of spending + 100 u of savings
= 30 + 40
= $70
Answer(s): $70