Question: (a) What is three times the difference between 50 and x?
(b) What is the quotient between x and the sum of y and 100?
(c) If the price of an item is a including 20% VAT (value added tax), what is the price before VAT?
(d) A person buys x1, x2, and x3 units of three goods whose prices per unit are respectively p1, p2, and p3. What is the total expenditure?
(e) A rental car costs F dollars per day in fixed charges and b dollars per kilometre. How much must a customer pay to drive x kilometres in 1 day?
(f) A company has fixed costs of F dollars per year and variable costs of c dollars per unit produced. Find an expression for the total cost per unit (total average cost) incurred by the company if it produces x units in one year.
(g) A person has an annual salary of $L and then receives a raise of p% followed by a further increase of q%. What is the person's new yearly salary?