You have 13 for every hundred and you have four hundreds...
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13% of 400 = 400*13/100 = 52 So 400 decreased by 13% = 400 - 52 = 348
13%
3.25% = 13/400
13%= 52 100%= 52/13 x 100= 400
x = 13% of x + 400 ie x/(x+400) = 13/100 100x = 13x + 5200 87x = 5200 x = 5200/87 = 59.77