But Sir if i see in this way,

profit 50,000 ===> (30,000 for cocunut + 20,000 for lemon)

but the question asks **yield** per area ratio of coconut and lemon (since the area is equal let us ignore it)

therefore let us find out the ratio of yield of coconut to lemon.

now we know 5rs per coconut therefore 30,000/5 = 6000 coconuts

but we don't know the price of each lemon so let us consider it X, therefore, 20,000/X lemons

Now,

yield of coconut : yield of lemons

ie no. of coconuts grown : no. of lemons grown

=> 6,000 / (20,000/x)

hence D ie cant be determined (Ans)