A car mechanic purchased four old cars for Rs. 1 lakh. He spent total 2 lakh in the maintenance and repairing of these four cars. What is the average sale price of the rest three cars to get 50% total profit if he has already sold one of the four cars at Rs. 1.2 lakh?

Ratio of selling price and Cost Price,
SP:CP = 12:9 =4:3

Profit of 3 oranges = Re 1 (Let CP = Re 1)
Profit = 1/3 = 33.33%

and, Discount = 11.11%
Since, CP : SP : MP = 3:4:4.5
Profit doubles that of discount.
So, % point discount = 33.33%-11.11% = 22.22% point.

Amount paid in 1st service = 100 (suppose)
Amount paid in 2nd service = 90
Amount paid in 3rd service = 81
Amount paid in 4th service = 72.9
Amount paid in 5th service = 60
Total amount paid = 403.9
Discount = 500 - 403.9 = 96.1
Discount % = 96.1 / 500 X 100 = 19.42%

Price of 10 chairs = 10 x 200 = 2000
Price of 12 chairs (without discount)= 12 x 200 = 2400
Price of 12 chairs (with discount) = 10 x 200 + 2 x 80 = 2160
Therefore discount = 2400 - 2160 = 240

Hence discount % = (240 / 2400) x 100 = 10%

Cost price (CP) = 500
Selling Price (SP) = 576
Markup price (MP) = 900

Again SP = MP [( 1 - r/100)²] [r - rate of discount in %]

? 576 = 900 (1 - r/100)²
? 24/30 = (1 - r/100)
? r = 20%
Again, new SP = MP (1 + r/100)²
= 900 (1 + 20/100)²
= 1296

New, profit percentage = [(SP - CP)/CP] X 100
= [( 1296 - 500 ) / 500 ] x 100 = 159.2%

In beginning
Cost Price (CP) = Rs. 100
Profit % = 20
Selling Price (SP) = 120

When profit increases from 20% to 25%
Cost Price (CP) = y
Profit % = 25
Selling Price (SP) after 25% increase = 120 + 25% = Rs. 150


From question
y + 25 % profit = 150

1.25 y = 150
so y = 120

% change in cost price = [ (120 - 100) / 100 ] x 100 = 20%

Setup cost = Rs. 2800
Paper etc. = Rs. 1600
Printing cost = Rs. 3200
Total cost = Rs. 7600
Total sale price = 1500 x 5 = 7500

Let the amount obtained from advertising is "A" then
(7500 - A) - (7600) = 25% of 7500
A= 1975

Charges of 1 call in February = 350 / 150 = 7/3
Charges of 1 call in March = [350 + ( 50 x 1.4) ] / 250
= 420 / 250
= 42 / 25

% Cheapness of a call in march = [(7/3 - 42/25) / 7/3] x 100
= 28%

Let the CP and SP of 1g = Re. 1, then
He spends Rs. 2000 and purchase 2200 g
and he charges Rs. 2000 and sells 1800 g

Profit (%) = [goods left / goods sold ] x 100
= [ 400 / 1800 ] x 100
= 22 2/9 %

Fresh grapes
Water: Pulp = 80% : 20% = 4 : 1

Dry grapes
Water: Pulp = 25% : 75% = 1 : 3
So out of 20 kg dry grapes, Water : Pulp = 5 kg : 15 kg

After adding of water the ratio of water : pulp is same as the fresh grapes = 4 : 1
So after adding water the quantity of Water and Pulp are 60 kg and 15 kg respectively.

Thus to make dry grapes similar to the fresh grapes, Akram requires 55 kg water with 20kg of dry grapes.

So, the profit (%) = (55 / 20) x 100 = 275 %

Let the total profit = 100
Amount left after donation = 50
Amount left after reinvestment = 20

Now, 5y/8 - 3y/8 = 1200
where y is the amount left after reinvestment
? 2x/8 = 1200
? x = 4800

? total profit = 4800 x 5 = 24000