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Jonas owns a pizza shop. He had 300 customers at the end of June 310 customers at the beginning of June, and 20 new customers in June. What is his customer retention rate for June?

a)95%
b) 90%
c) 85%
d) 80%

Jonas owns a pizza shop He had 300 customers at the end of June 310 customers at the beginning of June and 20 new customers in June What is his customer retenti class=