Answers

2015-04-09T20:11:15+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let the cost of a pen be : Rs P.
let the cost of a book be Rs B.

Loss on selling the pen:  Rs  P * 5/100
Profit on selling the book : Rs  B * 15/100

The overall gain =  15 B/100 -  5 P /100 = Rs 7
                            3 B - P = 140        ---(1)

gain on selling pen : 5 /100 * P
gain on selling book:  10/100 * B
total gain =  5/100 * P + 10/100 *  B =  13
                       P + 2 B = 260    -- (2)

add the two equations above: to get:    5 B = 400
   Price of book = Rs 80
  So price of pen =  3 B - 140 =  Rs 100.  by using (1) above.

1 5 1
200% of X is same as 2 * X.
profit = profit % * investment = 5% * I = 5/100 * I = I/20. Revenue = investment + profit = investment + investment * profit%. So Revenue = investment + 5/100 * investment = investment [ 1 + 5/100. So reveneue = investment * 105/100 = 1.05 investment.
loss = loss % * investment. revenue = investment - loss = investment - investment * loss% Hence, revenue = investment - investment * 5/100 = investment [1 - 5/100] = investment * 95/100 = 0.95 * Investment
profit => revenue > investment. Loss means revenue < investment.
So we can directly write: Let 22% profit occur, then Revenue = 1.22 * Investment. If 31% loss occurs, then revenue = 0.69 * investment.