Lease vs Bank Draft

My Mother Recently received an offer from Shale Exploration it was for a 320 acre tract

the lease spelled out 250 per acre yet the draft attached was for $884 The other offer she received on another tract when you took the Acres X the bonus it = the bank draft

so the questions is what rules Lease or Draft??

Very "fuzzy" math. Don't sign anything until Shale gets it right.