fix: simple earn Apr

[cryptokage1996]

Description

Closes:
https://trello.com/c/S0ETSMB0/344-pool-apr-is-wrong
https://trello.com/c/PahNxmt8/483-simple-earn-apr-is-returning-0

What has Changed?

Simple Apr returning zero , as it is truncating dec values to int so precession is loss

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