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Percentages

- What percentages are used in the uniformed services?

- To think of it as money......
- 10% is 10p in the pound (100p)
- 20% is 20p in the pound
- Percent means out of 100

- Divide the amount by 100 and multiply it by the percent you are looking for.
- So to find 10% of some thing divide the amount by 100 to find 1% and multiply it by 10.
- So to find 25% of something divide it by 100 and multiply it by 25

- 10% of £50
- 25% of 100km
- 40% of $90
- 65% of 150

- A switchboard takes 10 calls for an ambulance and 30 for the fire brigade, what percentage of calls are for ambulances?
- How do we do it?
- How many things (in this case phone calls) altogether?
- 10 + 30 = 40, then divide the number of the thing we are after by the total number and multiply by 100
- So.....10 ÷ 40 × 100 = 25%

- 60 ambulances do not make it to the patient within 7 minutes, 240 do, what percentage make it on time?
- 10 police cars, 20 riot vans and 20 mounted police are at a football match, what percentage are cars?
- 80 officers are combat trained and 40 are not, what percentage are combat trained?

- ¼ is 1 ÷ 4 = 0.25
- Didn’t we just say, to find a percent, it’s the bit we have/need, divided by the total and multiply by 100?
- So ¼ is 1 ÷ 4 = 0.25 then 0.25 × 100 = 25%
- So ½ is 1 ÷ 2 = 0.5 then 0.5 × 100 = 50%

- Tammy is going on holiday and has to pay a 20% deposit, her holiday costs £1500, how much would she need to pay?
- £1500 ÷ 100 = £15
- £15 × 20 = £300
- Tammy would need to pay a £300 deposit

- Simon is calculating how much he can save towards his wedding. He believes he can save 15% of his weekly wage of £230.
How much can he save per week?

How much is that in a year?

- Sophie decides that she needs a new work uniform, Uniforms4u offer the uniform at £80 but have a 30% off, Work-garbs have the uniform at £110 with a half price sale on. Which is cheapest?
- Jenni needs a new laptop and is told she needs one which is at least 30% faster than her current laptop which runs at 1000Mhz. What is the minimum speed she needs?