When 42 costumers are increased by 50% they become 63 costumers Because 42×50=2100 then 2100/100=21 then 21+42=63

this is how you find the answer: 1. multiply 42 by .50 to get 21 2. add 21 to the 42 customers 3. 21+42=63 So, 42 customers increased by 50% is 63