$P(\text{Win}) = P(\text{HH}) + P(\text{HT}) + P(\text{TH}) = $$\large \frac{3}{4}$
$P(\text{Loss}) = P(\text{TT}) = $$\large \frac{1}{4}$
So in every 4 plays there will be 1 $(TT)$ where we will lose ₹3 but in remaining 3 plays we will win $2+1+1 =$ ₹4
So total amount won in 4 plays = ₹1
Similarly, Total amount win in 100 plays = $\frac{100}{4} =$ ₹25