570
^
500+70
^ ^
250+250+70
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250 + 70 = 320
This is a subtraction problem. 250 - 70 = 180. This is true because 180 + 70 = 250.
70= 250 - (72%/100% * 250)= 250 - (0.72 * 250)= 250 - 180= 70
70 ÷ 100 × 250 = £175Therefore: 250 - 175 = £75
3.5714