Asalesperson makes $128 commission selling merchandise. his commission rate was 5%. find the dollar amount of his sales

5% of $128 = (128÷100) x 5

128÷100=1.28; 1.28=1%; 1.28 x 5 = 5%; 1.28 x 5 = 6.4, or $6.40. 

To find $128 + 5%, add $6.40 to $128 and you get $134.40.

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