PSLE Bobby was given a fixed amount of allowance each month. In September, he spent $340 and saved the rest. In October, he spent 10% less and his savings increased by 40%. How much was Bobby's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $340 |
100 u
|
Change |
- 10% |
+ 40 u |
After |
90% |
140 u |
100% of spending = 340
1% of spending = 340 ÷ 100 = 3.4
10% of spending = 10% x 340 = 34
10% of spending = 40 u of savings
40 u of savings = 34
1 u of savings = 34 ÷ 40 = 0.85
100 u of savings = 100 x 0.85 = 85
Bobby's allowance for each month
= 100% of spending + 100 u of savings
= 340 + 85
= $425
Answer(s): $425