PSLE Ian was given a fixed amount of allowance each month. In November, he spent $240 and saved the rest. In December, he spent 30% less and his savings increased by 40%. How much was Ian's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $240 |
100 u
|
Change |
- 30% |
+ 40 u |
After |
70% |
140 u |
100% of spending = 240
1% of spending = 240 ÷ 100 = 2.4
30% of spending = 30% x 240 = 72
30% of spending = 40 u of savings
40 u of savings = 72
1 u of savings = 72 ÷ 40 = 1.8
100 u of savings = 100 x 1.8 = 180
Ian's allowance for each month
= 100% of spending + 100 u of savings
= 240 + 180
= $420
Answer(s): $420