Dear Sirs

Your statement of account for the December quarter has been found in order but we think you have made an error in the special discount shown. In your letter of 15 September last you agreed to allow us 5% extra quarterly transactions exceeding £1000 in value.

The amount of the statement in question is £1,106, but you have shown discount at only 2,5%

Will you kindly adjust this, after which we shall be pleased to pass the account for payment.

Yours faithfully