Repeated percentage change

Maths

Growth and decay

What would the value of £300 become if it grew by 5% and then another 5%?

If an antique appreciates by 6% per year for 11 years, the decimal multiplier would be 1.06^11.

If I want to find the 'original' price of something that is currently in a sale and has 40%, I always need to find 100% of the amount to work out the original price.

If I start with a number, increase it by 30% and then decrease it by 30%, I get back to the original number.

The decimal multiplier to increase an amount by 6% for 5 years would be...

If 75% of my number is 150, what is my number?

If I buy a car in a 20% off sale and it costs £30,000, how much did the car originally cost?

If I decreased the amount I paid for my car insurance by 90% to £36.50 per year, how much did I pay previously for my car insurance?

If a jumper was marked as 56% off and costs £50 now, then 44% of the original cost of the jumper is equal to £50

If I know something costs £2.10 in a 30% off sale, then i would do £2.10 = 70% and scale accordingly to get that 100% = £3 to find the original amount.

This lesson will soon be taken down.

Repeated percentage change

Lesson outcome