Joan works on commission for a furniture store. She gets a base pay of $80 a day plus 5 percent of value of any merchandise she sells that exceeds a total of $400. Joan wrote the expression 400+0.05(t-80),where t represents her sales total in dollars, to compute the total amount of money that she will make. For sales of $475 Joan calculated that she will make $419.75. Explain Joan’s error. . I dont get the error… what is the error???
The expression to calculate her pay should be 80+0.05(t-400)
That is assuming her 5% of the difference. The formula is her base pay (80) added to the 5% of the merchandise over 400.
The answer I got using the new formula, using 475 for t:
80+0.05(475-400) = Total pay
80+3.75= Total pay
$83.75 is her total pay that day.