5(2p-1)+25% of 8p=31
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5(2p-1) +25/100 x 8p =31
5(2p-1) +1/4 x8p =31
5(2p-1) + 2p =31
10p-5 +2p=31
8p-5=31
8p =31+5
8p = 36
p =36/8
p = 4.5
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