A lap-top computer that cost a dealer $423.00 less 33&1/3%, 16&2/3%, is marked up 183&1/3% of cost. For quick sale, the lap-top was reduced 66&2/3%. (a) What was the cost? (Do not include the $ sign in your answer.) (b) What was the regular selling price? (Do not include the $ sign in your answer.) (c) What was the sale price? (Do not include the $ sign in your answer.) (d) What rate of markup based on cost was realized? (Correct to 3 decimals, do not include the % sign in your answer.) (If your answer is a negative number, include the negative sign before the answer, with no space.)