Components are made by machines A$,$ B$,$ C and D$.$

Machine A makes $17\%$ of the components, machine

B makes $21\%$ of the components, machine C makes

$20\%$ of the components and machine D makes the

remainder. For machine A$,96\%$ of the components

are reliable, for machine B$,89\%$ are reliable, for

machine C$,92\%$ are reliable and for machine D$,97\%$

are reliable. A component is picked at random.