1.Store owners hire staff to help with daily sales. In this item, the earnings are a reflection of the sales made by the stores, for this reason, the staff that is hired has a monthly base salary that, in general, borders the minimum allowed by law plus a certain percentage of sales that each one makes. A seller at that store has a base salary of s / 850 per month plus 10% of sales during the month. How much did a seller charge if he accumulated s / 12000 of sales during the month? How much did you manage to sell if you received s / 2400 of salary in a month?