PSLE Linda spent $700 in February. This amount was a 40% increase from what she spent in January. The amount she spent in March was a 35% decrease 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 |
+ 40% |
|
February |
140% |
100 u |
Change |
|
- 35 u |
March |
|
65 u |
(a)
Spending in January = 100%
Spending in February = 100% + 40% = 140%
140% = 700
1% = 700 ÷ 140 = 5
Spending in January
= 100%
= 100 x 5
= $500
Spending in February = 100 u
Spending in March = 100 u - 35 u = 65 u
100 u = 700
1 u = 700 ÷ 100 = 7
Spending in March
= 65 u
= 65 x 7
= $455
Total spending from January to March
= 500 + 700 + 455
= $1655
(b)
Decrease in spending in March compared to January
= 500 - 455
= $45
Percentage decrease
=
Decrease in spendingSpending in January x 100%
=
45500 x 100%
= 9%
Answer(s): (a) $1655; (b) 9%