Im not understanding the steps on how to get an answer to this type of problem, plz help asap!

A local piano distributor is preparing its February purchase budget for pianos and provides the following information: - Budgeted Sales, January: 210 pianos - Budgeted Sales, February: 170 pianos - Budgeted Sales, March: 230 pianos If the distributor always wants to have 20% of the pianos they will need for the next month's sales on hand at the end of each month, how many pianos do they need to purchase in February? A local piano distributor is preparing its February purchase budget for pianos and provides the following information: - Budgeted Sales, January: 210 pianos - Budgeted Sales, February: 170 pianos - Budgeted Sales, March: 230 pianos If the distributor always wants to have 20% of the pianos they will need for the next month's sales on hand at the end of each month, how many pianos do they need to purchase in February