Ensure operating expense value is always at least divisible by 100.

src/server/farm.scm

@@ -1738,7 +1738,9 @@
 
 (define (make-player-pays-per-unit unit amount)
   (lambda (player)
-    (let ((to-pay (* (player-asset (normalize-crop unit) player) amount)))
+    (let ((to-pay (farming-round-down
+                   (inexact->exact
+                    (round (* (player-asset (normalize-crop unit) player) amount))))))
       (safe-set! (player-cash player)
         (- (player-cash player) to-pay)))))
 
@@ -2382,6 +2384,3 @@
 ;; TODO
 ;; make sure two players can't have the same name
 ;; info actions should look better
-;; you can get $50 from operating expense
-
-;; mark spaces