Answer:
32 calendars 
Explanation:
Make an inequality 
Let x represent calendars 
8x+350 > 600 
Solve, first by subtract 350 from both sides 
8x>250
Divide by 8 on both sides 
x> 31.25 
They must sell at least 32 calendars, because if they only sold 31, they would not meet their goal. 
Hope this help! :)