Question

Work out the percentage change when a price of £20 is increased to £50.

Answer 1

150%

Explanation:

Let's say the 20 increased by x%. Then, we can write the equation:

20 + x% * 20 = 50

Notice that both terms on the left side have 20, so we can factor this out:

20 * (1 + x%) = 50

Divide both sides by 20:

1 + x% = 50/20 = 2.5

Subtract 1 from both sides:

x% = 1.5

Remember that % simply means "out of 100", so x% = x/100:

x/100 = 1.5

Multiply both sides by 100:

x = 150

Thus, the percent increase is 150%.

Hope this helps!

Answer 2

The percentage change from 20 to 50 is 150 %

Explanation:

(50 - 20) / 20) * 100 = 150 %