PSLE Charlie was given a fixed amount of allowance each month. In November, he spent $180 and saved the rest. In December, he spent 40% less and his savings increased by 20%. How much was Charlie's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $180 |
100 u
|
Change |
- 40% |
+ 20 u |
After |
60% |
120 u |
100% of spending = 180
1% of spending = 180 ÷ 100 = 1.8
40% of spending = 40% x 180 = 72
40% of spending = 20 u of savings
20 u of savings = 72
1 u of savings = 72 ÷ 20 = 3.6
100 u of savings = 100 x 3.6 = 360
Charlie's allowance for each month
= 100% of spending + 100 u of savings
= 180 + 360
= $540
Answer(s): $540