PSLE Linda spent $390 in February. This amount was a 30% increase from what she spent in January. The amount she spent in March was a 10% decrease from what she spent in February.
- What was the total amount that Linda spent from January to March?
- What was the percentage increase in the amount Linda spent in March compared to January?
|
Spending |
January |
100% |
|
Change |
+ 30% |
|
February |
130% |
100 u |
Change |
|
- 10 u |
March |
|
90 u |
(a)
Spending in January = 100%
Spending in February = 100% + 30% = 130%
130% = 390
1% = 390 ÷ 130 = 3
Spending in January
= 100%
= 100 x 3
= $300
Spending in February = 100 u
Spending in March = 100 u - 10 u = 90 u
100 u = 390
1 u = 390 ÷ 100 = 3.9
Spending in March
= 90 u
= 90 x 3.9
= $351
Total spending from January to March
= 300 + 390 + 351
= $1041
(b)
Increase in spending in March compared to January
= 351 - 300
= $51
Percentage increase
=
Increase in spendingSpending in January x 100%
=
51300 x 100%
= 17%
Answer(s): (a) $1041; (b) 17%