An article is sold in Rs 678 at a profit of 13%. Find its cost price.
Please help me

Rs 600.

Step-by-step explanation:

113% is equivalent to Rs 678   So by proportion:

100%  ..   ...   ..  ..    to 678 * 100 / 113

= Rs 600.

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below:

-6 is the correct option from the above given options