In a batch machining operation, setup time is $1\mathrm{.}5$ hours and batch size is $80$ units. The cycle time consists of purt handing tirne of $30$ sec and processing time of $1\mathrm{.}37$ min. One part is produced each cycle. Fool changes must be performed every $10$ parts and this takes $20$ min Detertenine averane cycle time in minutes.

a$.3$

b$.4$

c $2$

d $1$

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