On a journey a certain weight of luggage is carried free, but there is a charge of £10 per kilogram for any additional luggage above this weight. Laa-laa’s luggage, which weighs a total of 50kg, is overweight and she is charged £150. If Po’s luggage weighs a total of 30kg, what will she have to pay?
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Junior Mathematical Challenge 1999 (1999)
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