10 points!
If you are going to answer, actually answer!

Step-by-step explanation:

1/27

Explanation:-

(1/3)^3=(1x1x1)/(3x3x3)=1/27

The extra amount added to the selling price to arrive at the cost price.

Step-by-step explanation:

The mark up amount is the extra amount added by a seller to the cost price of a commodity to cover expenses and profit in fixing the selling price.

It is the difference between the cost price and the selling price.

It is calculated as a percentage of either the selling price or the cost price.

Hence, the right option is " the extra amount added to the selling price to arrive at the cost price".