Furniture City bought chairs for $75 less 33 13%, 20%, and 10%. The stores overhead is 75%

Question:

Furniture City bought chairs for $75 less 33 1⁄3%, 20%, and 10%. The store’s overhead is 75% of cost and net profit is 25% of cost.
(a) What is the regular selling price of the chairs?
(b) At what price can the chairs be put on sale so that the store incurs an operating loss of no more than 33 1⁄3% of the overhead?
(c) What is the maximum rate of markdown at which the chairs can be offered for sale in part (b)?