A local toolmaker makes the best hammers on the market. The head of the hammer costs $10.91 and the handle costs $5.26. It takes 1.4 minutes to assemble the hammer, and the hourly cost is $77 for assembly time. The company has fixed operating costs of $21565 per month. They sell the hammers for three times their total variable cost. The company wants to make a monthly profit of $6292. How many hammers must they sell? Round to the nearest whole number.
a) 174
b) 186
c) 199
d) 215