Question 503363
Let x be the number of 		calls								
company B			10	+	0.10	x				
company A			20	+	0.05	x				
company B	<	company A								
20	+	0.05	x 			<	10	+	0.10	x 
20	+	0.05	x 			<	10	+	0.10	x 
20	-	10				<	0.1	x	-0.05	x
10	<	0.05	x 							
200	<	x								
x should be greater than			200	calls