16. A shopkeeper buys two T.V. sets of the same type. He sells one of them at a profit of 20% and the other
at a loss of 5%. If the difference in selling prices is 700, find the cost price of each T.V. set.
17. A publisher sells a book for 168 at a profit of 20%. If his cost of production increases by 30%, what
should be the increase in the price of the book so that his percentage profit remains the same ?
Answers
Answer.
16.Ans.₹2800
17.Ans.₹50.4
Explanation.
16.Let the C.P of each T.V set be Rs.x
∴ S.P of first T.V Set=x+ 20x/100=120x/100
S.P of second T.V Set=x− 5x/100=95x/100
According to the question, difference in selling prices=700
∴ 120x/100 -- 95x/100 =700
=25x/100 =700
x =2800
thus, CP of each T. V. set is ₹2800
17.
Given, SP 1=₹168
profit =20%
hence, SP 1 is 120% of CP 1
=168 =X CP 1
=CP 1=168 X 5/6
=28X5=140
new cost of production is increased by 30%
so, new CP, CP 2 =140
=14X13=182
New profit percentage should be same as previous
hence, new SP, SP 2=CP 2 X120%
=182X
=182X 1.2 =218.4
Increase in price of box =SP 2 - SP 1
=218.4 - 168
=50.4