It looks like you are planning to buy terahash from some sellers on miningrigrentals?
I think it depends on the unit power efficiency, like the sample. I think the S19 XP could draw 22watts per 1 terahash.
Without the electricity fee, you could make $0.0383 per 1 terahash with the current difficulty. That should be the cost per day with 1Th.
You can calculate it for yourself using this tool:
https://www.mycryptobuddy.com/BitcoinMiningCalculatorIf I sold him hash with my t21 I would want 10-15% over what it can hash I can give him 180th it earns 180 x 3.92 cents or
180x0.0392= $7.056 I would charge $8 or
8/180=0.0444
so yeah 4.44 cents a th would be my charge.
0.0392x1.13=0.044296
it is a 13% markup
and that's fair because he never purchased the gear. so my markup is for the gear I own and the labor to program it for him.
here are the 2 units 61th and 121th
