PSLE Linda spent $1200 in June. This amount was a 20% increase from what she spent in May. The amount she spent in July was a 25% 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 |
|
- 25 u |
July |
|
75 u |
(a)
Spending in May = 100%
Spending in June = 100% + 20% = 120%
120% = 1200
1% = 1200 ÷ 120 = 10
Spending in May
= 100%
= 100 x 10
= $1000
Spending in June = 100 u
Spending in July = 100 u - 25 u = 75 u
100 u = 1200
1 u = 1200 ÷ 100 = 12
Spending in July
= 75 u
= 75 x 12
= $900
Total spending from May to July
= 1000 + 1200 + 900
= $3100
(b)
Decrease in spending in July compared to May
= 1000 - 900
= $100
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
1001000 x 100%
= 10%
Answer(s): (a) $3100; (b) 10%