Ian earns £420 a week after a 5% rise. What was his pay before?
Ian had a 5% rise, so £420 = 105% of his original pay
To find 1% of his original earnings, divide £420 by 105.
Multiply this by 100 to find his old pay:
1% of his original earnings = 420/105 = £4
Original earnings = £4 × 100 = £400
HS
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