The answer depends on the country (or region) whose currency you are working with. For example, the US has a 25 cent coin but not a 20 cent coin. The Eurozone has a 20 cent but not a 25 cent. Some countries have no coins smaller than 10 minor units.
Since you have not specified which country/region you are interested in, it is not possible to provide a more useful answer.
100x1p coins make a pound..
3 quarters 3 nickels and 10 pennies 25X3=75 5X3=15 1X10=10 75+15+10=100
To make 55 cents with 15 coins you will use 10 pennies, 1 quarter, and 4 nickles.
You can't make fractions of cents.
15
100x1p coins make a pound..
3 quarters 3 nickels and 10 pennies 25X3=75 5X3=15 1X10=10 75+15+10=100
Fifteen 50p coins.
To make 55 cents with 15 coins you will use 10 pennies, 1 quarter, and 4 nickles.
Easy. Use 100 5-cent coins.
12 x 100/80 ie 15%
100
You can't make fractions of cents.
15
The US Mint did not make any 100 dollar coins in 1959.
0.15 = 15/100
Five dimes and ten nickels.