Question

Someone help me with the following problems

Problem 1
Assume that 35% of fish sold in the terminal comes from Lake Amatitlan, 40% comes from the Port of San José, and the remaining 25% from the Atlantic coast. Assume also that 70% of the fish that comes from Amatitlán is contaminated, 20% of the Port of San José is contaminated, of the fish that comes from the Atlantic coast, 15% is contaminated. If you choose a random fish.
Determine:
a) the probability that the fish is contaminated
b) If the fish is contaminated, what is the probability that the origin is from Amatitlán
c) If it is discovered that it is not contaminated, what is the probability that its origin is from the Atlantic coast.

Problem 2
In the area of ​​official reports, four reports were received that measure risk, seven accountants and two with financial information. Determine how many forms you can deliver the reports if:
a) There is no special order
b) The two risk are delivered first, then the financial and finally the accounting.
c) The four that measure risk must be delivered last

Answer 1