The ''off peak'' weekly average cost of hiring a caravan in Wales is £520. In July the average cost increases to £800. Calculate the percentage increase in cost. Give your answer to two significant figures.

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]