$3.$ Assume that there are $3$ call options on ABC Bank shares with exercise prices of Rs$\mathrm{.}1200,$ Rs$\mathrm{.}1250$ and Rs$\mathrm{.}1300$ with the same expiry date. Spot price of the shares is Rs$\mathrm{.}1225.$ Assume that the call prices are Rs$\mathrm{.}80,$ Rs$\mathrm{.}50$ and Rs$\mathrm{.}30$ for the respective strike prices. Construct a bullish call spread using these call options. Show the payoff profile for this strategy assuming that on expiry day, the share price falls within the range of $1000$ to $1500$ at intervals of Rs$\mathrm{.}50,$ i$.$e$.1000,1050,1100,1150..\mathrm{.}1450,1500.$ Also show the payoff diagram.