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?
Let X be the value of the certificate.
Jolene earned $240 over 4 years so 240 = X*2% * 4
240 = 0.02*X*4
240 = 0.08*X
X = 240 / 0.08
X = $<<3000=3000>>3,000. Answer: \boxed{3000}.