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15. Puto balanghoy or steamed cassava cake is traditionally made in the Visayas
region using basic ingredients such as cassava, brown sugar and grated
coconut. Marvin is selling a puto balanghoy in the function of f(x) 10x,
how much is Marvin's income if a customer wants to buy a total of 50 pieces?
A. Php450
C. Php550
B. Php500
D. Php600​