Jill bought a lamp for $40. She sold it at a garage sale for $12. What was the approximate decrease?

5/6+7/8what is the answer sealsdbdbshd

Ineed to know the answer to this algebra question.

Write each of the following numerals in base 10. for base twelve, t and e represent the face values ten and eleven, respectively. 114 base 5 89t base 12