P=100(s-c)÷c
multiply both sides be c
cP = 100s - 100c
add 100c to both sides
cP + 100c = 100s
take out c as a common factor
c(P + 100) = 100s
divide both sides by P + 100
c = 100s/(P + 100)
P=100(s-c)÷c make c subject of the formalar
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