The consignments of chemical instruments have just reached us . We have to lodge a claim against you for inferior quality I am afraid .   Is there anything wrong ?   We bought 1,000 sets of chemical instruments from you , but there are 40 not up to the standard .   It's hard for us to believe it . Our instruments have been the best quality for years . Have you any reliable evidence ?   Here is the survey report from a well-known public surveyor in London . You may inspect the defective instruments personally   Well . According to the contract , we are responsible for repairing or replacing those defective instruments . We ’ ll send our technicians to repair them .   Forty faulty instruments means that 4 % are not up to the standard . You should compensate us for 4 % of the total account on the contract , as well as for the inspection fee .   I am sorry about the quality problem , but I propose we compensate you for 3 % of the total value apart from the inspection fee .   All right . In that case we are still willing to do business with you . 