invest 1% of equity per stock

Hello,

I set my inital equity= 50000 and I buy every month 5 stocks for 10000.

Now I would like to say that if I have more equity in the end of the month I would like to invest again 10000 per stock + 1% of the rest.

For example:
new equity = 100000 -> 50000 + 50000

50000: -> invest 1% of 50000 = 500

in total I would invest 12500 per stock this month.

Does anybody has an idea?

thanks in advance.

invest 1% of equity per stock