A restaurant buys Lemons from three suppliers ‘P’, ‘Q’ and ‘R’. Records show that 30% of the Lemons come from ‘P’, 55% c

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A restaurant buys Lemons from three suppliers ‘P’, ‘Q’ and ‘R’.
Records show that 30% of the Lemons come from ‘P’, 55% come from
‘Q’ and the rest come from ‘R’.
Further records show that 8% of Lemons supplied by ‘P’ are
substandard, 12% of Lemons supplied by ‘Q’ are substandard and 15%
of Lemons supplied by ‘R’ are substandard.
A waiter working at the restaurant randomly selects a Lemon and
finds it to be substandard.
Calculate the probability that this Lemon came from
supplier ‘Q’.