\text { Alal and Dulal shopped at the same store. Alal bought } 5 ~kg \text { of apples and } 2 ~kg \text { of bananas and paid } \text { altogether BDT22. Dulal bought } 4 ~kg \text { of apples and } 6 ~kg \text { of bananas and paid together BDT 33. Find the } \text { cost of } 1 ~kg \text { of bananas. }