The Jayden family eats at a restaurant that is having a 15% discount promotion. Their meal cost $78.90 before the discount, and they leave a 20% tip. If the tip applies to the cost of the meal before the discount, what is the cost of the meal?

(16%) consider 3 digits integers 100 till 999. (a) (6%) compute the probability of 3 digits even number such as 100, 102, 104, etc. (b) (10%) compute the probability of a 3 digits integers with the sum of 3 digits an even integer. for example, 123 is 3 digits with sum of 3 digits even (sum =6), but 315 is 3 digits with sum of 3 digits odd (sum = 9).