Here are some numbers (all in million RMB yuans) from the income account for the city of Shanghai in 2017: labor compensation = 14997, business proftis = 8780, depreciation of fixed assets = 3924, net production taxes = 5224, private consumption expenditures = 12970, government consumption expenditures = 4581, net exports = 889.

(a) Calculate Shanghai's GDP in 2017 using the income method;

(b) Calculate the labor income's share in Shanghai's GDP;

(c) Calculate the investment rate in Shanghai.