a car park charges 1.50 to each car entering. the car park only accepts £1 coins and 50p coins. here are the coins collected on a particular day. number of £1 coins: 172 number of 50p coins:256 making the assumption that all drivers paid the exact amount due on that day, work out the percentage of drivers that paid with three 50p coins
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Subtract the amount of £1 coins from 50p coins:
256-172 = 84
84/3 coins = 28 people paid with 3 coins.
172 people paid using £1 coins
172 + 28 = 200 total people
percent who used 3 coins = 28/200 = 0.13 x 100 = 14%
14%