Mountain Equipment Co-op purchased tents for $334.89 less 27%, 18%, and 6%. The store's overhead is 55%

Question:

Mountain Equipment Co-op purchased tents for $334.89 less 27%, 18%, and 6%. The store's overhead is 55% of cost and the normal profit is 21% of cost.
(a) What is the regular selling price of the tents?
(b) At what price can the tents be put on sale so that the store incurs an operating loss of no more than 20% of the overhead?
(c) What is the maximum rate of markdown at which the tents can be offered for sale in part (b)?