PSLE Linda saved $180 in May. This amount was a 10% decrease from what she saved in April. The amount she saved in June was a 10% increase from what she saved in May.
- What was the total amount that Linda saved from April to June?
- What was the percentage decrease in the amount Linda saved in June compared to April?
|
Savings |
April |
100% |
|
Change |
- 10% |
|
May |
90% |
100 u |
Change |
|
+ 10 u |
June |
|
110 u |
(a)
Savings in April = 100%
Savings in May = 100% - 10% = 90%
90% = 180
1% = 180 ÷ 90 = 2
Savings in April
= 100%
= 100 x 2
= $200
Savings in May = 100 u
Savings in June = 100 u + 10 u = 110 u
100 u = 180
1 u = 180 ÷ 100 = 1.8
Savings in June
= 110 u
= 110 x 1.8
= $198
Total savings from April to June
= 200 + 180 + 198
= $578
(b)
Decrease in savings in June compared to April
= 200 - 198
= $2
Percentage decrease
=
Decrease in savingsSavings in April x 100%
=
2200 x 100%
= 1%
Answer(s): (a) $578; (b) 1%