Fund  had a unit value of $1.0 on January 1, 1991 and a unit value of $0.8 on July 1, 1991.The unit value on New Year's Day 1992 was $1.0, and the Fund received $10 on New Year's Day 1991 and on 1 July 1991, both immediately.

Invest in funds. The income in 1991 was calculated by capital weighting method and time weighting method respectively.