Question

If someone spends 90% of there money and has 50p left how much did they start with

Answer 1

500p because 50 times 100 is 500

Answer 2

is someone has spent 90% of their money and they're only left with 50p, this 50p represents the 10% remaining.

multiply 10% × 10 to get 100% ( i.e. the original amount)

(50p) × 10 = 500p

answer is 500p