Paul earns a weekly paycheck consisting of base pay of $ 350, plus a commission of 6.8% of his weekly sales in excess of $ 5,000 (So, Paul earns the commission only on the amount of sales over $ 5,000. For instance, if his sales are $6 000.He earns commission only on $ 1,000. Assume Paul's sales are always more than $ 5000

Write an equation that can be used to determine Paul's weekly paycheck P, given the amount of weekly sales, X

Determine Paul weekly paycheck if his weekly sales are 15,240

Determine paul's weekly sales if his weekly paycheck is 678.44