€2  multiplied by 10 = €20 

There are twenty  five cents in €1

fifty cents is equivalent to 20c + 20c + 10c

There are twenty 10c in €1

How much change would I get from €7.20 if I gave 10 euro

If an apple cost me 90c and a banana cost me €1.10 and an orange cost me €1.20 how much did i spend overall?

€8.52 - €3.40 = €4.12

4 x 50c is equivalent to €2

There are twenty five 20c in 5 euro

If I spent €8.25 in a shop and I had 10 euro how much change do I get?

How can you make €8.72 using the least amount of coins 

€2 + €1 + 50c + 10c +5c +2c +2c = €3.69

€1 + €2 + €5 + 20c + 5c +1c = €9.06

€10 + €5 + €20 + 50c +20c +20c +5c +2c = €35.97