Why did Qin Shihuangdi believe he should be the next ruler of China?

He believed he had the mandate of heaven.
He believed he was the people’s choice to rule.
He believed he could open China to outside trade.
He believed he could turn China into a seafaring empire.

He believed he had the mandate of heaven.

Explanation:

When emperors gain power, they claimed that they had a mandate from the gods justifying their rule.

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.

you would times this by how many days there are in a year 365*400=$146000