Percentages Flashcards

1
Q

Increase £42 by 35%

A

42x1.35=£56.70

You want to find 35%. Add (add because increase) 35% to 100%=1.35

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2
Q

Decrease £83 by 6.2%

A

83x0.938=£77.85

100% - 6.2% (take away because decrease) = 0.938%

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3
Q

£6000 invested into a saving account that pays 4% per annum. How much will you have after 3 years?

A

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

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4
Q

Mark buys a motorbike for £6,000. If depreciates in value by 12.5% every year. How much is it worth after 7years?

A

(12.5% is of the new amount every year)
6000x0.875^7=2356.175423
=£2356.18

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5
Q

£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?

A

£8000x0.06=£480
480x3=£1440
8000+1440=£4440

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6
Q

A sale is on: 20% off everything. A TV is now worth £360. How much was it before the sale?

A
80% = £360
/divided by 8
10% = £45
(x10
100% = £450
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7
Q

Matt receives a 35% pay rise and now earns £1620 per month. How much did he earn (per month) before the pay rise?

A
135% = £1620
/ divided by 135
1%=£12
/ x100
100%=1200
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8
Q

Find 21 as a percentage of 35 (no calculator)

A
21/35
/divided by 7
3/5
/times by 20
60/100
= 60%
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9
Q

Find 8nas a percentage of 23 (calculator allowed)

A

8/23 x 100 = 34.7826…
=34.8%
(You can have percentages as decimals)

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10
Q

8.4(recurring)3567(recurring) is the same as what? (Give the number without the recurring)

A

8.435674356743567…

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11
Q

What is the equation for percentage profit?

A

Percentage profit = (profit / original amount) x 100

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12
Q

Tony bought a box of 24 oranges for £4. He sold all the oranges for 21p each, work out his percentage profit

A

24x21=504pence =£5.04
Profit = 5.04-4 =£1.04
%profit =1.04/4x100=26%

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13
Q

What is the equation for percentage loss?

A

Percentage loss = loss / original amount x 100

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14
Q

Mark buys a rare coin for £80 and sells it at a loss for £50. What is the percentage loss?

A

Loss = 80-50=£30

%loas =(30x80)x100=37.5%

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