Ahigh school chorus has $1000 in its school account at the beginning of the year. they are putting on a fall concert to raise money for a trip later in the year. at the concert last year they sold tickets for $10 each. if they sell tickets at the same price the total amount in the chorus account can be represented by the linear function t = 10x + 1000. if they increase the ticket price to $15, how many tickets will they have to sell to have a total of $4000 in the account?