Math Qustion ! !

If there are only profit% and profit , how to find the cost price ?

Let the cost price be $c
Let the selling price be $s
Let the profit be $p
Le the profit percentage be q%

Given p = s - c ….(i)
Given q = (s - c) / c
Thus,
cq = s - c
cq + c = s
Put (s = cq + c) into (i), we get
p = (cq + c) - c
p = cq
c = p/q
that is,

cost price = (profit)/(profit%)

設成本係$c
設賣價係$s
設利潤係$p
設利潤百分率係p%

已知道p = s - c ….(i)
已知道q = (s - c) / c
所以
cq = s - c
cq + c = s
將 (s = cq + c) 代入 (i), 得到
p = (cq + c) - c
p = cq
c = p/q
所以

成本=(利潤) / (利潤百分率)

Hope can help you(希望可以幫到你).