PSLE Linda spent $675 in June. This amount was a 25% 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 decrease in the amount Linda spent in July compared to May?
|
Spending |
May |
100% |
|
Change |
- 25% |
|
June |
75% |
100 u |
Change |
|
+ 20 u |
July |
|
120 u |
(a)
Spending in May = 100%
Spending in June = 100% - 25% = 75%
75% = 675
1% = 675 ÷ 75 = 9
Spending in May
= 100%
= 100 x 9
= $900
Spending in June = 100 u
Spending in July = 100 u + 20 u = 120 u
100 u = 675
1 u = 675 ÷ 100 = 6.75
Spending in July
= 120 u
= 120 x 6.75
= $810
Total spending from May to July
= 900 + 675 + 810
= $2385
(b)
Decrease in spending in July compared to May
= 900 - 810
= $90
Percentage decrease
=
Decrease in spendingSpending in May x 100%
=
90900 x 100%
= 10%
Answer(s): (a) $2385; (b) 10%