The graph below shows the amount of money charged by two electricity providers per month, depending on the amount of electricity used. Calculator EN allowed a) Alexander uses 240 kWh of electricity per month. Which provider would be cheaper for Alexander? b) Lawrence uses 180 kWh of electricity per month. How many more kWh of electricity would Lawrence have to use per month to mean that he would be charged the same amount of money by provider A as by provider B? If your answer is a decimal, give it to 1 d.p. Cost per month (£) 0 Provider A y= +25 12 Provider B +35 y=200 Electricity usage per month (kWh)