Adam spends $700 of his income and saves the rest.
When he increases his spending by 40%, his savings decreases by 10%
- How much is Adam's savings at first?
- How much is Adam's savings in the end?
- How much is Adam's income?
|
Spending |
Savings |
Before |
100% |
100 u |
Change |
+ 40% |
- 10 u |
After |
140% |
90 u |
(a)
40% of Adam's spending = 10% of Adam's savings
100% of Adam's spending = $700
1% of Adam's spending = 700 ÷ 100 = $7
40% of Adam's spending = 40 x 7 = $280
10 u of Adam's savings = $280
1 u of Adam's savings = 280 ÷ 10 = $28
100 u of Adam's savings = 100 x 28 = $2800
Amount of Adam's savings at first
= 100 u
= $2800
(b)
Amount of savings in the end
= 90 u
= 90 x 28
= $2520
(c)
Adam's income
= 100% + 100 u
= 700 + 2800
= $3500
Answer(s): (a) $2800; (b) $2520; (c) $3500