PSLE Linda spent $240 in June. This amount was a 20% 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 |
+ 20% |
|
June |
120% |
100 u |
Change |
|
- 30 u |
July |
|
70 u |
(a)
Spending in May = 100%
Spending in June = 100% + 20% = 120%
120% = 240
1% = 240 ÷ 120 = 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 = 240
1 u = 240 ÷ 100 = 2.4
Spending in July
= 70 u
= 70 x 2.4
= $168
Total spending from May to July
= 200 + 240 + 168
= $608
(b)
Decrease in spending in July compared to May
= 200 - 168
= $32
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
32200 x 100%
= 16%
Answer(s): (a) $608; (b) 16%