I did not understand what you mean, I will explain what I understood from you

The price of Bitcoin is $65 935.
You bought 100 Bitcoins which will be 100/65935 = 0.0015166451808599 BTC.
now you want to trade out at 66935. 0.0015166451808599* 66935 =  101.5166451808574 USD

your gain is 1.5 dollar

Invest Now and sold at 66k will make 31 dollar
Is that what you mean?