Suppose that call options on a stock with strike prices of $$30$ and $$35$ cost $$6\mathrm{.}9$ and $$4,$ respectively. Use these options to construct a bull spread $(\_/).$ What is the profit of the strategy if the stock price is $28$ at expiration?

$($required precision: $0\mathrm{.}01+/-0\mathrm{.}01)$