Percentages Flashcards
Increase £42 by 35%
42x1.35=£56.70
You want to find 35%. Add (add because increase) 35% to 100%=1.35
Decrease £83 by 6.2%
83x0.938=£77.85
100% - 6.2% (take away because decrease) = 0.938%
£6000 invested into a saving account that pays 4% per annum. How much will you have after 3 years?
Per annum = per year
(You can’t just work out 1 year x 3, because you have a different amount at the start of each year.
6,000 x 1.04^3
(1.04=%increase, ^3=years)
=6749.184
=6749.18
Mark buys a motorbike for £6,000. If depreciates in value by 12.5% every year. How much is it worth after 7years?
(12.5% is of the new amount every year)
6000x0.875^7=2356.175423
=£2356.18
£8000 is invested in an account that pays 6% every year the money is in he account. You receive the money (in interest) as a cheque at the very end. How much money in total would you have after 3 years?
£8000x0.06=£480
480x3=£1440
8000+1440=£4440
A sale is on: 20% off everything. A TV is now worth £360. How much was it before the sale?
80% = £360 /divided by 8 10% = £45 (x10 100% = £450
Matt receives a 35% pay rise and now earns £1620 per month. How much did he earn (per month) before the pay rise?
135% = £1620 / divided by 135 1%=£12 / x100 100%=1200
Find 21 as a percentage of 35 (no calculator)
21/35 /divided by 7 3/5 /times by 20 60/100 = 60%
Find 8nas a percentage of 23 (calculator allowed)
8/23 x 100 = 34.7826…
=34.8%
(You can have percentages as decimals)
8.4(recurring)3567(recurring) is the same as what? (Give the number without the recurring)
8.435674356743567…
What is the equation for percentage profit?
Percentage profit = (profit / original amount) x 100
Tony bought a box of 24 oranges for £4. He sold all the oranges for 21p each, work out his percentage profit
24x21=504pence =£5.04
Profit = 5.04-4 =£1.04
%profit =1.04/4x100=26%
What is the equation for percentage loss?
Percentage loss = loss / original amount x 100
Mark buys a rare coin for £80 and sells it at a loss for £50. What is the percentage loss?
Loss = 80-50=£30
%loas =(30x80)x100=37.5%