What Borrowing Really Costs
Today I can work out the total cost of borrowing when fees or interest are added.
A Look back3 min
- 1.
A school trip has a budget of £50. £30 is spent. How much is left?
- 2.
Mia has £100 in a savings account. Interest of £5 is added. How much does she have now?
- 3.
Jai has been paid in coins for jobs at home: a 50p, a 20p and another 20p. How many pence in total?
B Watch me, then you4 min
Priya buys a £120 pair of shoes on Buy Now Pay Later. She misses a payment and is charged a £24 late fee. How much does she owe in total?

The price is 120 and the late fee is 24.
The fee is added on top, so 120 + 24 = 144.
Priya owes £144 in total.
- 1.
Leo buys a £90 game on Buy Now Pay Later. He misses a payment and is charged a £15 late fee. How much does he owe in total?
C Your turn6 min
Each sum adds the fee or interest on top of the amount borrowed. Work out the total each time.
- 1.
Ali borrows £100. He is charged £10 interest. How much does he owe in total?
- 2.
Mia borrows £200 and is charged £20 interest. How much does she owe in total?
- 3.
Noah's bike costs £60. He is charged £6 for one late payment and £4 for another. How much does he pay in total?
- 4.
Zara's sofa costs £250. She is charged two late fees of £25 each. How much does she pay in total?
Say it out loud: What was added each time, and did the total go up or down? What changed from one question to the next?
D Spot the mistake3 min
- 1.
What does it really cost in total?
E Think deeper4 min
In this made-up example, one bike costs £60 if paid on time and £80 if paid late. The bar chart shows both costs.
- 1.
How much more does the bike cost if paid late? Why might a company not make this extra cost easy to see? Write one sentence for each.
How did it feel?
Think about how you felt when you worked out the true cost. Did anything surprise you? Who could you ask before you borrow money?