PSLE Linda spent $750 in February. This amount was a 25% decrease from what she spent in January. The amount she spent in March was a 20% increase from what she spent in February.
- What was the total amount that Linda spent from January to March?
- What was the percentage decrease in the amount Linda spent in March compared to January?
|
Spending |
January |
100% |
|
Change |
- 25% |
|
February |
75% |
100 u |
Change |
|
+ 20 u |
March |
|
120 u |
(a)
Spending in January = 100%
Spending in February = 100% - 25% = 75%
75% = 750
1% = 750 ÷ 75 = 10
Spending in January
= 100%
= 100 x 10
= $1000
Spending in February = 100 u
Spending in March = 100 u + 20 u = 120 u
100 u = 750
1 u = 750 ÷ 100 = 7.5
Spending in March
= 120 u
= 120 x 7.5
= $900
Total spending from January to March
= 1000 + 750 + 900
= $2650
(b)
Decrease in spending in March compared to January
= 1000 - 900
= $100
Percentage decrease
=
Decrease in spendingSpending in January x 100%
=
1001000 x 100%
= 10%
Answer(s): (a) $2650; (b) 10%