Question

Ann wants to buy a coffee machine. She knows, that during the holidays, the probability of a discount of more than 10% is 0.87, on weekends, the probability of a discount of more than 10% is 0.38, and on a regular weekday, it is 0.17.
On average there are 15 holidays per year, 100 weekends (holiday weekends are excluded) and 250 weekdays.
Find the probability of a discount of more than 10% for the randomly chosen day.
Find the probability that it was a weekend if it is given that she bought a machine with a discount of more than 10%.