A milk vendor purchased some milk at the rate of $7.50 and after mixing 30% of water to it sold the mixture at the cost price. His profit per cent is?


As per my understanding:

Say vendor purchases x gallons for 7.50$:

So, CP of x gallons = 7.50$
SP is x+30%x = 7.50$

profit = SP - CP

profit = 1.3x-x ------x(1.3 - 1)
profit = x(.3) i.e 30%

profit for x gallons sold at 7.50$ (750 ents) is 30%

for 750 cents profit is 30%

for 1 cent ? i guess its the same? i'm stuck here....