Gu Wenheng read the ledger while finding the time to answer him, "Naturally. Didn't I just tell you where the problems were? How could I know without calculating?"
"How did you manage that?" He Nan asked, feeling puzzled as he saw the abacus he had casually brought over still sitting there as a mere decoration.
Gu Wenheng didn't even look up. "The abacus is in my head. If you want to learn, I can teach you."
He had been exposed to this kind of mental calculation since childhood, so it was absolute second nature to him.
"The abacus is in your head?" He Nan simply dragged over a stool and sat quietly next to him, watching. At this speed, he estimated it wouldn't take long to get all these accounts sorted out.
Seeing Gu Wenheng flipping through the pages as if for fun, occasionally grabbing a brush to make a mark, his curiosity grew even stronger.
