Answer:18 ways
Step-by-step explanation:
Given
There are three color available for truck i.e. red, turquoise and green
Truck can have leather or cloth seats
Also there are 3 color available for interior
So no of ways in which a customer can choose a truck is
80 - [50 - {20/2 - (16 - 2/2) ÷ 3}]
80 - [50 - {20/2 - (15) ÷ 3}]
80 - [50 - {10 - 5}]
80 - [50 - {5}]
80 - [45]
35