Ameera purchased 100 units of laptops at OMR 150 each. She priced a unit to make a profit of 20% on the purchased price. However, when 25% of the units were left unsold she reduced the selling price by 10%, subsequently all the units were sold. Using the preceding information, how much will be the calculation of Ameera on the following?

A. The original selling price.

B. The reduced selling price.

C. The sales revenue they have all been sold

(Please I want step by step detailed solution)