Answer:
176 yards per minuye
Step-by-step explanation:
The first equation tells you that
. If you substitute this expression for
in the second, we have

And we can deduce 
320+124+876=1320 grams = 1.32 kg
1.32*$2.99=$3.95
-100-70+100-30=-100
I included the value of the merchandise that she "purchased", so the owner lost $100 in total value.