I dunno. I'd guess to take your monthly payments for the land being leased and multiply it by 12. Add in reasonable cost of repairs/upgrades/maintanance (is it the property itself or the land behind it?). Multiply the subtotal by 1.1 and you have your yearly lease rate, which covers a monthly bank payment and a 10% profit to you.

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White Carbon plus 60-70# RKT 31.5" draw
40-50# digital scale SpiralX 31" draw