29) C

Let the money refunded be ‘R’
Let total money before refunds = ‘M’
Money after refunds = £12240
M – R = £12240
40% paid £15 and 60% paid £20
Let the number of people who attended the concert = ‘P’

(0.6P x 20) + (0.4P x 15) = £12240
12P + 6P = £12240
18P = 12240
P = 12240/18 = 680 people

If 680 people paid £20 in advance, M = 680 x 20 = £13600
Refund = 13600 – 12240 = £1360

Hence, C is the answer

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