Answer:
38 normal tees and 24 striped 
Explanation:
There are two equations you will want to set up:
One will be the total amount of shirts sold (let x be normal tee shirts and y be striped) 
x + y = 62 
And then one for the cost 
15x + 22y = 1098 
Now multiply the first equation by -15 so we can use the elimination method so
-15x - 15y = -930
15x + 22y = 1098 
Now we can add those together and the x terms will cancell leaving 
7y = 168 
Divide by 7 
y = 24 
Now sub back into the amount of shirts equation 
x + 24 = 62 
Subtract 24:
x = 38