Dorothy lacks cash to pay for a $600 dishwasher.she could buy it from the store on credit by making 12 monthly payments of $52.74. the total cost would then be $632.88. instead,Dorothy decides to deposit $50 a month in the bank until she has saved enough money to pay cash for the dishwasher.One year later,she has saved $642-$600 in deposits plus interest. when she goes back to the store,she finds the dishwasher now costs $660.its price has gone up 10 percent.was postponing her puchase a good trade off for Dorothy?