Question

If toll interest is increased by 20% and it again increased by 20% then howany % increase in 1st main value

Answer 1

Answer:

$\frac{100 + 100 \times 20}{100} =120</p><p>$

$20 = \frac{120 + 120 \times 20}{100} =144$

-> 144 - 100 = 144 × x / 100

-> 44 = 144 × x / 100

-> x = 44 × 100 / 144

-> x = 30.555

Answer 2

let the % increase =x

what is 1% of x:(x/100)×1

what is 20% of x:20 ×(1%of x):20×(x/100)

it mean adding x% to the quantity itself or in words (100/x)% of the quantity.

similary decreasing a quantity by x% means (100-x)% of that quantity.

let the interest will be 100.

increasing 100 by20%.

(100+20)×(100/100)=120

now increasing 120 by 20%.

(100+20)×(120/100)=144.

this statement is x % of 144 Is 44.

(x/100)×144=44

x=(100*44)/144

x=30.5

1st main value 30.5.

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