Mrs paints yearly salary is $42,000 and increases $2,000 per year. mr paints yearly salary is $37,000 and increases $3,000 per year. how many years will mr. and mrs paint make the same salary?

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?