A householder keeps an annual account of four items of expenditure. The figures for the year 1991 are shown in the table below. Item: Expenditure () Taxes x Travel 1000 Light/Heat y 300 Telephone A pie chart was drawn to illustrate these data. Given that the angles of the sectors representing Taxes and Travel were 124 and 80 respectively, calculate

(a) the total expenditure for the year,

(b) the value of x and of y,

(c) the angle of each of the remaining sectors. In 1992, the total expenditure on the same items was 8000. Given that the radius of the pie chart for 1991 was 6 cm, calculate the radius of the pie chart for 1992 in order that the two sets of data- may be compared. (C Additional)