On Saturday, he served 3 times the amount of customers that he served on Friday, which was 28 customers so he served 3*28 = <<3*28=84>>84 customers
He served 28 customers on Friday, 84 on Saturday and 36 customers on Sunday for a total of 28+84+36 = <<28+84+36=148>>148 customers
Each customer tipped him $2.00 and he had 148 customers so he made 2*148 = $<<2*148=296.00>>296.00
#### 296