PSLE Linda saved $190 in September. This amount was a 5% decrease from what she saved in August. The amount she saved in October was a 20% increase from what she saved in September.
- What was the total amount that Linda saved from August to October?
- What was the percentage increase in the amount Linda saved in October compared to August?
|
Savings |
August |
100% |
|
Change |
- 5% |
|
September |
95% |
100 u |
Change |
|
+ 20 u |
October |
|
120 u |
(a)
Savings in August = 100%
Savings in September = 100% - 5% = 95%
95% = 190
1% = 190 ÷ 95 = 2
Savings in August
= 100%
= 100 x 2
= $200
Savings in September = 100 u
Savings in October = 100 u + 20 u = 120 u
100 u = 190
1 u = 190 ÷ 100 = 1.9
Savings in October
= 120 u
= 120 x 1.9
= $228
Total savings from August to October
= 200 + 190 + 228
= $618
(b)
Increase in savings in October compared to August
= 228 - 200
= $28
Percentage increase
=
Increase in savingsSavings in August x 100%
=
28200 x 100%
= 14%
Answer(s): (a) $618; (b) 14%