13.3 Rory's profit and loss account statements show the following figures for period 20X3 to 20X6 inclusive:

20X6 20X5 20X4 20X3

£

£

£

£

Sales 562 064 539409 520 665 505 500 Cost of sales

(410 619)

(392 802)

(378 879)

(368 509)

Gross profit 151 445 146 607 141 786 136991 Which of the following is correct? Analysed horizontally, these figures show:

a) A gradually increasing percentage of sales growth and a gradually increasing percentage of gross profit growth.

b) A gradually decreasing percentage of sales growth and a gradually increasing percentage of gross profit growth.

c) A gradually increasing percentage of sales growth and a gradually decreasing percentage of gross profit growth.

d) A gradually decreasing percentage of sales growth and a gradually decreasing percentage of gross profit growth.