A*B means multiply A by B; A@B means divide A by B, A?B means add B to A and A=B means subtract B from A.
Then find the value of 10*10 = 5*10 ? 50@10
Expression : 10*10 = 5*10 ? 50@10
$$\equiv10\times10-5\times10+50\div10$$
= $$100-50+5=55$$
=> Ans - (D)
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