Sarah bought 4 items and spent $30.10. whatdod she buy?

It depends what the owns they have you were. She spent a total of $120.40

You did not provide much information but Sarah could have bout 4 items each worth $7.52. This would be the total amount of money she spent divided by the quantity. 

I hoped this helped. 

The answer is that the rate of change is $50 per 1 monthhope this ; )