PSLE Linda spent $570 in June. This amount was a 5% decrease from what she spent in May. The amount she spent in July was a 20% increase from what she spent in June.
- What was the total amount that Linda spent from May to July?
- What was the percentage increase in the amount Linda spent in July compared to May?
|
Spending |
May |
100% |
|
Change |
- 5% |
|
June |
95% |
100 u |
Change |
|
+ 20 u |
July |
|
120 u |
(a)
Spending in May = 100%
Spending in June = 100% - 5% = 95%
95% = 570
1% = 570 ÷ 95 = 6
Spending in May
= 100%
= 100 x 6
= $600
Spending in June = 100 u
Spending in July = 100 u + 20 u = 120 u
100 u = 570
1 u = 570 ÷ 100 = 5.7
Spending in July
= 120 u
= 120 x 5.7
= $684
Total spending from May to July
= 600 + 570 + 684
= $1854
(b)
Increase in spending in July compared to May
= 684 - 600
= $84
Percentage increase
=
Increase in spendingSpending in May x 100%
=
84600 x 100%
= 14%
Answer(s): (a) $1854; (b) 14%