Question 1117371
In the first case :

The principle amount is $ 2200 (P)
The rate of interest.    is 4% (R)
The no. Of years.       is 1yr (T)
 Formula for calculating S.I is PTR/100
                                           = 2200*4*1/100
                                           = $ 88

Similarly in the second case :
                                   P is $ 2800
                                   R is 5%
                                   T is 1 yr
Hence                      S.I is 2800*5*1/100
                                           = $ 140

 The total interest gained by him will be $88 + $ 140 = $ 228

* hope u got the answer!!