My HP 10bII+ is much faster than HP 12c!

[Galuppo]

Hi guys!

As an Econ student I decided to first buy the HP10BII+ for its price and functionalities.

My cousin gifted me his Hp12c Platinum, 1 battery on the back and CN serial number engraved on the case, not as a sticker, that I had to sent to repair for just 20 bucks and needless to say I was stoked.

The problem now is that my 10bII+ feels so much faster and it never has the "running" sign.

For instance, the 12c took whooping 25 seconds when trying to calculate the required interest rate for a -45 PMT, 10925.76 FV and an N of 168 while the 10bII+ did it INSTANTLY!

I'd like to know if it's something with my calculator and if I should stick with the 10bII+.

Thanks a lot guys!