Question
For every guide book Riordan sells, he gets $4.90 as commission. He gets an additional $1.20 for every 6 guide books sold. How many guide books did Riordan sell if he earned $142 in commission?
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For every guide book Riordan sells, he gets $4.90 as commission. He gets an additional $1.20 for every 6 guide books sold. How many guide books did Riordan sell if he earned $142 in commission?