Problem #25-Solved by Peter Dun

I went to my favorite taco stand with some friends. Between us we bought $6$ tacos and $2$ burritos, and I noticed that the ratio of the amount we spent on tacos to the amount we spent on burritos was $7:4$. Later we went back and bought $4$ tacos and $3$ burritos and spent $1$ dollar less. How much money did we spent that time?