PSLE Vaidev was given a fixed amount of allowance each month. In September, he saved $220 and spent the rest. In October, he saved 10% more and his spending decreased by 20%. How much was Vaidev's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 10% |
- 20 u |
After |
110% |
80 u |
100% of savings = 220
1% of savings = 220 ÷ 100 = 2.2
10% of savings = 10% x 220 = 22
10% of savings = 20 u of spending
20 u of spending = 22
1 u of spending = 22 ÷ 20 = 1.1
100 u of spending = 100 x 1.1 = 110
Vaidev's allowance for each month
= 100% of savings + 100 u of spending
= 220 + 110
= $330
Answer(s): $330