Based upon these results, Saybolt extrapolated its gross profit for the provision of the remaining six certifications for 1990 and the 17 certifications for 1991 to be GBP 70,888.
基于这些结果，Saybolt推断在1990年提供其余6份证书和1991年提供17份证书的总利润为70,888英镑。