plz help me solve

Dave borrowed $600 on January 1,2022 The bonk charged him a $6.40 service charge, and interest was $44.90 if Dave paid the $600 in 12 equal monthiy payments, what was the APR? Note: Do not round intermediate calculations. Enter your answer as o percent rounded to 1 decimal place. Dorothy lacks cash to pay for a 5840.00 dishwasher. She couid buy it from the store on credit by making 12 monthly poyments of $7125. The totat cost would then be $855.00 instead. Dorothy decides to deposit $70.00 a month in the bank until the has saved enough money to pay cash for the dishwasher, One year later, she has saved $898.80584000 in deposits plus interest When she goes back to the store, she finds the dishwasher now costs $90888 its price has gone up 820 percent. Was postponing her purchase a good trade-off for Dorothy