1 Phase 2, Phase 3, Phase 4, Phase 5

1 2 shares, 4 shares and 8 shares 16 shares

①

Uncle Zhang stopped investing before the company went bankrupt.

Then he invested eight shares in the fourth period.

Investment amount: 450×8+ 10×8=3680.

Return amount: 530×8=4240

Yield: (560 ÷ 3680)100% =15.25438+0%

(2) When the number of additional investment shares of Uncle Zhang in a certain period is 16.

Investment amount: 450×16+/kloc-0 ×16 = 7360.

Return amount: 530×8=4240

Then, the loss is 3 120 yuan.