Answer:
We get
[tex]10\cdot 25+40\cdot 15=250+600=850[/tex]
Step-by-step explanation:
We know that there's a worker he works 10 hours each day for 14 days. Therefore, he works total 140 hours.
We know that: the big pieces cost 25 to make n 6 hrs to finish
and little ones cost 15 n 2 hrs to finish.
We conclude that he can make 10 the big pieces for 60 hours and he can make 40 the little ones for 80 hours. Threfore, he works 60+80=140 hours.
We get
[tex]10\cdot 25+40\cdot 15=250+600=850[/tex].