Tom o reka setlhopha sa kamore ya borobalo ka $3000.  O rekisa setlhopha sa gagwe sa kgale sa kamore ya borobalo ka $1000 mme a dirisa madi ao go duelela bontlha bongwe jwa setlhopha se sesha.  Go tswa foo o tshwanetse go duela 10% kgwedi le kgwedi go duelela setlhopha se sesha.  O tshwanetse go duela bokae kgwedi le kgwedi?

One dwarf can mine 12 pounds of ore per day with his bare hands. He can mine twice as much with an iron pickaxe and 50% more with a steel pickaxe than with an iron pickaxe. How many pounds of ore can 40 dwarves with steel pickaxes mine in a month with 30 days?
O tshwanetse go duela 3000-1000=$<<3000-1000=2000>>2000
Ka jalo o tshwanetse go duela 2000*.1=$<<2000*.1=200>>200 kgwedi le kgwedi
#### 200 

First find how much ore a dwarf can mine with an iron pickaxe: 12 pounds/day * 2 = <<12*2=24>>24 pounds/day
Then multiply that amount by 150% to find how much a dwarf can mine with a steel pickaxe: 24 pounds/day * 150% = <<24*150*.01=36>>36 pounds/day
Then multiply the amount one dwarf can mine in a day with a steel pickaxe by the number of dwarves: 36 pounds/day/dwarf * 40 dwarves = <<36*40=1440>>1440 pounds/day
Then multiply the daily amount of ore by the number of days to find the total ore mined in a month: 1440 pounds/day * 30 days = <<1440*30=43200>>43200 pounds/day
#### 43200