PSLE Ethan was given a fixed amount of allowance each month. In November, he saved $70 and spent the rest. In December, he saved 20% less and his spending increased by 10%. How much was Ethan's allowance for each month?
|
Savings (%) |
Spending (u) |
Before
|
100% $70 |
100 u
|
Change |
- 20% |
+ 10 u |
After |
80% |
110 u |
100% of savings = 70
1% of savings = 70 ÷ 100 = 0.7
20% of savings = 20% x 70 = 14
20% of savings = 10 u of spending
10 u of spending = 14
1 u of spending = 14 ÷ 10 = 1.4
100 u of spending = 100 x 1.4 = 140
Ethan's allowance for each month
= 100% of savings + 100 u of spending
= 70 + 140
= $210
Answer(s): $210