PSLE Bobby was given a fixed amount of allowance each month. In November, he saved $60 and spent the rest. In December, he saved 40% less and his spending increased by 20%. How much was Bobby's allowance for each month?
|
Savings (%) |
Spending (u) |
Before
|
100% $60 |
100 u
|
Change |
- 40% |
+ 20 u |
After |
60% |
120 u |
100% of savings = 60
1% of savings = 60 ÷ 100 = 0.6
40% of savings = 40% x 60 = 24
40% of savings = 20 u of spending
20 u of spending = 24
1 u of spending = 24 ÷ 20 = 1.2
100 u of spending = 100 x 1.2 = 120
Bobby's allowance for each month
= 100% of savings + 100 u of spending
= 60 + 120
= $180
Answer(s): $180