What's 369*6 cos I got 61.3 but the calculator shows 61.5

Can somebody me out with this question

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list