5.2.2 Percentages, PT3 Practice


Question 6:
Liza had 360 apples. She sold ⅝ of the apples. Then she gave 27 of the remaining apples to her neighbour.
Calculate the percentage of apples that Liza has left.

Solution:
Number of apples sold = 5 8 ×360 =225 Number of apples left =36022527 =108 Percentage of apples left = 108 360 ×100% =30%


Question 7:
Mei Ling took part in a science quiz competition. She answered 12 questions correctly. She answered 25% of the questions incorrectly.
Find the total number of questions in the quiz.

Solution:
75%12 correct answers 25%? incorrect answers Number of incorrect answers = 25 75 3 ×12 =4 Total number of questions =12+4 =16


Question 8:
Diagram below shows the prices of two items.


Kenny buys a pair of track pants and 2 pieces of sweaters.
Calculate the total amount Kenny has to pay.

Solution:
Price of a pair of track pants after 25% discount =RM150.00( 25 100 ×RM150.00 ) =RM150.00RM37.50 =RM112.50 Total amount Kenny has to pay =( RM100.00×2 )+RM112.50 =RM312.50


Question 9:
Table below shows the prices and the discounts for the same brand of school bag sold at four shops, P, Q, R and S


Which shop offers the cheapest price?

Solution:
Shop P, Price per item after discount =RM100( 20 100 ×RM100 ) =RM80 Shop Q, Price per item after discount =RM110( 30 100 ×RM110 ) =RM77  Shop R, Price per item with no discount =RM170÷2 =RM85 Shop S, Price per item with no discount=RM90 Shop Q offers the cheapest price.


Question 10:
Table below shows dividend received by Janice from her investment.


Janice reinvests RM204 from the total dividends she received into ASB investment.
What is the remaining percentage that she did not use in her reinvestment?

Solution:
Dividends from ASB =3%×RM 2000 = 3 100 ×RM 2000 =RM 60 Dividends from ASN =4%×RM 7000 = 4 100 ×RM 7000 =RM 280 Total dividends =RM 60+RM 280 =RM 340 Percentage of dividends not reinvested = 340204 340 ×100 = 136 340 ×100 =40%


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