12. Electricity Company A charges 14 € per unit for the first 100 units in a quarter, and 11 % per unit after that. Electricity Company B charges a flat rate of $12 per unit. How many units must a customer use per quarter for Company A to be the cheaper option?
13 Taxi company A charges a minimum of $ 2.25 for each journey of up to 2 miles, plus per mile for every mile over that. Taxi company B has no minimum fare, but charges 95 per mile. Which of the following is the minimum number of miles over which taxi company A is cheaper than taxi company B ?
A 4