1.BY selling a Coat for $630, a shopkeeper gains 5%.find the cost price of coat

2.Paul Bought a car for $960 and sold it to David at a profit of 5%.David Sold it to Tommy at a profit of 10%.Find The money paid by Tommy for the car

:confused:

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- Dec 30th 2005, 02:07 AMshauryaTwo problem sums
1.BY selling a Coat for $630, a shopkeeper gains 5%.find the cost price of coat

2.Paul Bought a car for $960 and sold it to David at a profit of 5%.David Sold it to Tommy at a profit of 10%.Find The money paid by Tommy for the car

:confused: - Dec 30th 2005, 04:19 AMshaurya
I am in 7th grade.i cant do it & i have to show it tommorow

- Dec 30th 2005, 04:35 AMCaptainBlack
If I sell something for n% profit, and I bought it for $x and sold for $y then

$\displaystyle \frac{y-x}{x}=\frac{n}{100}$,

which may be rearranged to give:

$\displaystyle y=x(1+\frac{n}{100})$.

Quote:

Originally Posted by**shaurya**

s/he paid for it.

So if x is the buying price:

$\displaystyle 630=1.05 \times x$,

so:

$\displaystyle x=630/1.05$

Quote:

2.Paul Bought a car for $960 and sold it to David at a profit of 5%.David Sold it to Tommy at a profit of 10%.Find The money paid by Tommy for the car

:confused:

$\displaystyle 960\times 1.05$

David sold it for what he paid times 1.10 so he sold it for:

$\displaystyle 960\times 1.05 \times 1.10$,

which is what tommy paid for it.

RonL - Dec 30th 2005, 04:46 AMshaurya
thnx

:D