6 . A factory produces jackets . The cost $ C of producing x jackets can be 1
2 modelled by C( x) � ( x �90 ) � 60 . 2
( a ) Find the cost of producing 100 jackets .
[ 2 ] The cost of production should not exceed $ 1310 . To do this the factory needs to produce at least n jackets and at most 140 jackets .
( b ) Find the value of n .
( c ) Find the number of jackets produced when the cost of production is lowest .
[ 2 ]
[ 2 ]
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