40% of [100 - 20% of 300] is equal to
(a) 20
(b) 16
(c) 140
(d) 64

Solution:

To determine the outcome of the given expression we use the concept of percentages.

Given: 40% of [100 - 20% of 300]

we first calculate:

20% of 300, which is

(20/100) × 300

= (1/5) × 300

= 60

Hence the expression 40% of [100 - 20% of 300] reduces to

40% of [100 - 60]

40% of [40]

= (40/100) × 40

= 1600/100

= 16

✦ Try this: 80% of [200 - 20% of 600] is equal to

To determine the outcome of the given expression i.e 80% of [200 - 20% of 600] we first calculate:

20% of 600, which is

(20/100) × 600

= (1/5) × 600

= 120

Hence the expression 80% of [200 - 20% of 600] reduces to

80% of [200 - 120]

40% of [80]

= (40/100) × 80

= 3200/100

= 32

☛ Also Check: NCERT Solutions for Class 8 Maths Chapter 8

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NCERT Exemplar Class 8 Maths Chapter 9 Problem 19

40% of [100 - 20% of 300] is equal to (a)20, (b) 16, (c) 140, (d) 64

Summary:

40% of [100 - 20% of 300] is equal to 16

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