Target buys pants for $6.42 and marks up the price for customers by 70%. How much do they sell pants for? 0.7\left(6.42\right)=\$4.490.7(6.42 )=$4.49

$4.49 is not the correct answer. What is the mistake? Explain.

To find the answer do the following

$6.42*.70=$4.49 this is the mark up

Now $6.42+$4.49=$10.91 for the sales price

So Target sells the plants for $10.91 to their customers.

You just forgot to add the initial price to the mark-up

Hope it helps.