PSLE Bobby was given a fixed amount of allowance each month. In January, he spent $360 and saved the rest. In February, he spent 10% less and his savings increased by 40%. How much was Bobby's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $360 |
100 u
|
Change |
- 10% |
+ 40 u |
After |
90% |
140 u |
100% of spending = 360
1% of spending = 360 ÷ 100 = 3.6
10% of spending = 10% x 360 = 36
10% of spending = 40 u of savings
40 u of savings = 36
1 u of savings = 36 ÷ 40 = 0.9
100 u of savings = 100 x 0.9 = 90
Bobby's allowance for each month
= 100% of spending + 100 u of savings
= 360 + 90
= $450
Answer(s): $450