Selina solutions

Selina solutions

Grade 6

Percent (Percentage) | Revision Exercise

Question 13

Q13) Evaluate :

(i) 8% of 900 – 12% of 750 + 20% of 165.

(ii) 70% of 70 + 90% of 90 – 120% of 120.

Solution:

(i) 8% of 900 - 12% of 750 + 20% of 165

=\frac{8\times900}{100}-\frac{12\times750}{100}+\frac{20\times165}{100}

= 72 - 90 + 33 = 72 + 33 - 90

= 105 - 90 = 15

(ii) 70% of 70 + 90% of 90 - 120% of 120

=\frac{70\times70}{100}+\frac{90\times90}{100}-\frac{120\times120}{100}

= 49 + 81 - 144 = 130 - 144 = - 14

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Question 13

Q13) Evaluate :

(i) 8% of 900 – 12% of 750 + 20% of 165.

(ii) 70% of 70 + 90% of 90 – 120% of 120.

Solution:

(i) 8% of 900 - 12% of 750 + 20% of 165

=\frac{8\times900}{100}-\frac{12\times750}{100}+\frac{20\times165}{100}

= 72 - 90 + 33 = 72 + 33 - 90

= 105 - 90 = 15

(ii) 70% of 70 + 90% of 90 - 120% of 120

=\frac{70\times70}{100}+\frac{90\times90}{100}-\frac{120\times120}{100}

= 49 + 81 - 144 = 130 - 144 = - 14

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subject-cta
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