One week, the music store sold 2 trumpets, 3 clarinets, and 5 violins for $1,240. the next week, they sold 3 trumpets, 1 clarinet, and 4 violins for $1,027. the following week, they sold 5 trumpets, 7 clarinets, and 2 violins for $2,091. find the cost of a trumpet, clarinet, and violin.