please show workings

Dan buys and sells puff-puff. He sells each plate of puff-puff at 12 and buys at 5. Puff-puff has to be sold warm and cannot be reheated He knows that on a good day he can sell as much as 3,000 plates, on an average day he can sell as much as 1,000 plates and on a bad day he sells only 15 plates Assuming there is a 40% chance that it will be a good day, a 30% chance that it will be an average day and a 30% chance that it will turn out to be a bad day, How much should the management of Dan pay for the perfect information to make the perfect decision each time