Question

A car is moving with a certain speed. If it increases
its speed by 20% and after sometime decreases it
by 10%, then finally the percentage change in its
initial speed is
(1) 20% increase
(2) 8%increase
(3) 12% decrease
(4) 6% decrease ​

Answer 1

Answer:

12 % is answer correct answer

Step-by-step explanation:

Tony stark

Answer 2

Answer:

The percentage change in its initial speed is an 8% increase.

Step-by-step explanation:

Given,

the car is moving at a certain speed (u).

The speed got increased by 20% and after some time it decreases by 10%.

To find,

The percentage change in its initial speed (Δu %)

Calculation,

First, we calculate the change in speed Δu.

Increase in speed = u + 20 % of u = 1.2u

Δu =  increase in speed - decrease in speed

Δu =  20 % of u - 10 % of (increase in speed )

Δu =  0.2u - 10 % of (increase in speed)

Δu = 0.2u - 0.1(1.2u)

Δu = 0.08u

Δu/u × 100 = 0.08 × 100 = 8 %

therefore, the percentage change in its initial speed is an 8% increase.

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