PSLE Linda spent $260 in February. This amount was a 35% 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 |
- 35% |
|
February |
65% |
100 u |
Change |
|
+ 20 u |
March |
|
120 u |
(a)
Spending in January = 100%
Spending in February = 100% - 35% = 65%
65% = 260
1% = 260 ÷ 65 = 4
Spending in January
= 100%
= 100 x 4
= $400
Spending in February = 100 u
Spending in March = 100 u + 20 u = 120 u
100 u = 260
1 u = 260 ÷ 100 = 2.6
Spending in March
= 120 u
= 120 x 2.6
= $312
Total spending from January to March
= 400 + 260 + 312
= $972
(b)
Decrease in spending in March compared to January
= 400 - 312
= $88
Percentage decrease
=
Decrease in spendingSpending in January x 100%
=
88400 x 100%
= 22%
Answer(s): (a) $972; (b) 22%