## Basic College Mathematics (10th Edition)

Using the 4% column of the compound interest table, the compound amount for 4 years is found to be 1.1699. Multiply this amount times the principal to calculate the amount at the end of 4 years.. $1.1699×1870=2187.71$ dollars The interest is the difference between the compound amount and the principal. $2187.71-1870=317.71$ dollars