Explanation
Suppose B joined for x months . Then, $$\dfrac{ ( 85000 \times 12 )}{(42500 \times x)} = 3$$
$$=> x = \dfrac{(85000 \times 12)}{ (42500 \times 3) }$$
$$=>x= 8$$
So, B joined for 8 months.
Let the original value of the tempo be Rs. x. Then,
C.P. of $$50 Kg$$ wheat = $$ (30 \times 11.50 + 20 \times 14.25)$$
$$= Rs. (345 + 285) = Rs. 630.$$
S.P of $$50 Kg$$ wheat=130% of 630=$$\frac{130}{100}\times 630=819 Rs$$
S.P. per kg=$$\frac{819}{30+20}$$
=$$\frac{819}{50}$$
=$$16.40 Rs.$$
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