Prove the following

Question:

 40% of [100 – 20% of 300] is equal to:

(a) 20

(b) 16

(c) 140

(d) 64

Solution:

(b) 16

Explanation: 40% of [100 – 20% of 300]

= 40% × [100 – (20/100×300)]

= 40% × [100 – 60]

= 40/100 × 40

= 16

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