My fault it's actually B:5e7 S:3.5ea. (a = 7 in this situation)
5 Followed by 7 zeroes (50,000,000)
3.5 shifted left until there are no decimal points (dps) which would be 1 time in this situation (a-1=x) and followed by x amount of zeroes (35,000,000)
"shifted left until..." / multiplied by...