PSLE Linda spent $220 in June. This amount was a 10% increase from what she spent in May. The amount she spent in July was a 30% decrease from what she spent in June.
- What was the total amount that Linda spent from May to July?
- What was the percentage decrease in the amount Linda spent in July compared to May?
|
Spending |
May |
100% |
|
Change |
+ 10% |
|
June |
110% |
100 u |
Change |
|
- 30 u |
July |
|
70 u |
(a)
Spending in May = 100%
Spending in June = 100% + 10% = 110%
110% = 220
1% = 220 ÷ 110 = 2
Spending in May
= 100%
= 100 x 2
= $200
Spending in June = 100 u
Spending in July = 100 u - 30 u = 70 u
100 u = 220
1 u = 220 ÷ 100 = 2.2
Spending in July
= 70 u
= 70 x 2.2
= $154
Total spending from May to July
= 200 + 220 + 154
= $574
(b)
Decrease in spending in July compared to May
= 200 - 154
= $46
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
46200 x 100%
= 23%
Answer(s): (a) $574; (b) 23%