An orange vendor makes a profit of 20% by selling oranges at a certain price. if he charges Rs. 1.2 higher per orange he would gain 40%. find the original price at which he sold the orange
a) 5
b.)4.8
c.) 6
d.)none of these

Question

mathmath333 · Answer

@Michele_Laino

jhannybean · Answer

Trying to understand how to account for the 40%,

perl · Answer

Profit = selling price - cost to producer

perl · Answer

Let x = selling price
 y = cost to distributor 

.20x = x - y
.40x = (x+1.2) - y

mathmath333 · Answer

y=?

mathmath333 · Answer

u mean $c$

perl · Answer

just to give you an idea of how this comes about, 
first use a simple example

profit = selling price - cost

20 rands = 100 rands - 80 rands

perl · Answer

oops, rupees

perl · Answer

20 is 20% of 100

mathmath333 · Answer

by the way option $b$ and $c$ both are given wronh

mathmath333 · Answer

*wrong

perl · Answer

what do you mean

bibby · Answer

I was feeling D

mathmath333 · Answer

it is giving option $d$ as right

bibby · Answer

none of the options increased by 1.2 were a 40% gain anyways

mathmath333 · Answer

there are two selling prices here

perl · Answer

ok maybe it makes more sense to say profit percent based on cost

perl · Answer

Let 
x = original selling price
y = cost to producer

profit = selling price - cost 

.2y = x - y

.4y = ( x + 1.2) - y

perl · Answer

http://www.wolframalpha.com/input/?i=solve+.2y+%3D+x+-+y%2C+.4y+%3D+%28+x+%2B+1.2%29+-+y+

mathmath333 · Answer

$cool ~thats ~correct$

perl · Answer

Check:

 selling price 7.2 Rs.  - cost of 6 Rs. = 1.2 Rs. 
selling price 8.4 Rs. - cost 6 Rs. = 2.4 Rs.

1.2 Rs. is 20% of 6 Rs. 
2.4 Rs. is 40% of 6 Rs.