The dealer needs to give a discount of 5%,
#therefore# Selling price (SP) = Marked price(MP) - Discount:
#=>SP = MP - 5/100 xx MP #......... (#because# discount is 5%)
#=> SP = MP (1-0.05)= 0.95xx MP#
#=> SP = 0.95 xxMP#..... equation(1)
He wants a profit of 23.5 % on the Cost price (CP):
So he needs to sell it for :
#SP = CP + 23.5/100 xx CP#
#=> SP = CP(1+ 0.235)#
#=> SP = 1.235xx CP# ........ equation (2)
Equating (1) and (2):
#1.235xx CP = 0.95xx MP#
#=> MP = 1.235/0.95 xxCP #
#=> MP = 1.3 xxCP#
#=> MP =CP(1 + 0.3 )#
#=> MP = CP + 30/100 xx CP#
So the dealer must mark the computer 30% above the cost price.
#ul(Cross- check)#:
Let CP = 100
MP will be 130
After giving Discount 5% ,
#SP = 130- 5/100 xx 130 = 130- 6.5#
#therefore SP = 123.5 # where CP was 100.
So he gets 23.5 % profit.