In this lesson, we will learn about the cumulative effect of repeated percentage changes.
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If I buy a car in a 20% off sale and it costs £30,000, how much did the car originally cost?
Correct answer: £37,500
£37,500
£6,000
37,500
6,000
Q3.
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?
£3.65
£32.90
£36.50
Correct answer: £365
£365
Q4.
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
False
Correct answer: True
True
Q5.
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.
What would the value of £300 become if it grew by 5% and then another 5%?
£305
£310
£330
Correct answer: £330.75
£330.75
Q2.
If an antique appreciates by 6% per year for 11 years, the decimal multiplier would be 1.06^11.
False
Correct answer: True
True
Q3.
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.
False
Correct answer: True
True
Q4.
If I start with a number, increase it by 30% and then decrease it by 30%, I get back to the original number.
Correct answer: False
False
True
Q5.
The decimal multiplier to increase an amount by 6% for 5 years would be...
