March 15, 1997 Dear Sirs: We enclose our new catalogue and price list. The revised prices will apply from I April 1997. You will see that there have been a number of changes in our product range. A number of improved models have been introduced. Our range of washing machines has been completely revamped (改变). Many popular lines, however, have been retained unchanged. You will be aware that inflation (通货膨胀) is affecting industry as a whole. We have been affected like everyone else and some price increases have been unavoidable. We have not, however, increased our prices across the board. In many cases, there is a small price increase, but in others, none at all. We can assure you that the quality of our consumer durables has been maintained at a high standard and that our service will continue to be first class. We look forward to receiving your orders. Yours faithfully, John Smith Manager What’s the purpose of the letter To inform the customer of ______.