Jolene bought a savings certificate that earned 2% in simple interest per year. She earned a total of $240 in interest over four years. How much was the certificate worth, with interest, after four years?

Ihave this math question 2/3 ÷2 1/10=

Lois and clark own a company that sells wagons. the amount they pay each of their sales employees (in dollars) is given by the expression 12h+30w12h+30w where hh is the number of hours worked and ww is the number of wagons sold.

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?