According to the meaning of the question, [100 (1+x)-50] (1+x) = 63.

50x2+ 125x- 13 = 0。

The result is x 1 =, x2 =-.

∫x2 =- irrelevant,

∴x= = 10%。

A: The annual interest rate for the first deposit is 10%.

Ask for adoption! ! ! ! ! !