I keep getting question two b wrong I get 0.266 and it says wrong

Prize Chances $15,000,000 1 chance in 300,000,000 $450,000 1 chance in 200,000,000 $75,000 1 chance in 20,000,000 $5,000 1 chance in 4,000,000 $900 1 chance in 700,000 A watch valued at $60 1 chance in 4,000 (a) Find the expected value (in dollars) of the amount won by one entry. 0.073535 (b) Find the expected value (in dollars) if the cost of entering this sweepstakes is the cost of a postage stamp (34 cents). Instructions