Mundane Masterwork Enhanced +5 Hardness, +25 HP Longsword.
Total Cost equals 19150 Silver Pieces, or 1915 Gold Pieces
19150 SP
DC 15 for Longsword, DC 30 for Mundane Masterwork Enhanced Component.
Level 10 Craftsman.
10 Ranks Craft Arms
+6 Skill Focus
+2 Intelligence
+2 MW Tools
= +20 Modifier, taking 10 = DC 30.
Result Multiplied by DC = 900 SP work
19150 Divided By 900 = 21.2777(Repeating)8 Weeks. Round up to 22 weeks.
22 Weeks (7 Days a week) equals 154 Days.
Final Calculations
+5 Hardness, +25 HP Mundane MW Enhanced Longsword.
DC 15 Longsword, DC 30 MW Component.
Total Item Cost = 1915 Gold.
Requires 10th level Blacksmith with 10 Ranks in Craft arms, minimum 14 intelligence, MW Tools, Skill Focus (Weaponsmithing) feat. Taking 10 as a result.
22 weeks = 154 Days to create weapon.
Final Results
Item - MW Longsword. (Mundane Enhanced)
Cost - 1915 Gold.
Time - 154 Days.
Benefits - +5 Hardness, +25 HP.
Item - +3 Magic Longsword
Cost 18,000 Gold
Time 36 Hours
Benefits - +6 Hardness, +30 HP, +3 To Hit Enhancement.