Final answer:
Kathy would make $234 selling 78 bottles of lotion.
Step-by-step explanation:
To calculate the amount of money Kathy would make, we need to find the total number of bottles she sold and then multiply that by the amount she gets paid per bottle.
Kathy sold 48 bottles at the trade show and another 30 bottles this weekend, so the total number of bottles she sold is 48 + 30 = 78 bottles.
Now we can calculate the amount of money Kathy would make by multiplying the total number of bottles (78) by the amount she gets paid per bottle ($3). The calculation would be 78 x 3 = $234.
Therefore, Kathy would make $234 selling 78 bottles of lotion.