100y+x=230
150y+x=320
Y being the price per kilogram of steel bar, x being the added delivery fee.
If you were to solve the equaltion it would go x=230-100y by changing the first equation around the replacing that for the x int he second group, so you would get 150y+230-100y=320 or 50y=90 So Y=9/5dollars per kilogram. Or $1.8per kilogram, the delivery fee being $50
The probability is 1/12, or 8.33333333333% (the threes go on forever)
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Add the value of the car with her savings and cash:
18,200 + 525 + 2800 = 21,525
Now subtract her net worth:
21,525 - 9,025 = 12,500
Her loan is $12,500