One silver denarius would have been quite a good day's wage, but spending it would have been difficult. A slave could be bought for twenty denarii (or drachma).
The silver four drachma piece, also called a stater, was equal to the Semitic shekel, which is probably the coin referred to in the story of Judas Iscariot, so the reward would have been surprisingly large just for identifying someone already known to the religious leaders.
Gold and silver, as was customary at the time.
one silver coin
Before his time spent as a preacher, Jesus was a carpenter.
It is the basic unit of time in both systems.
Mary is thought to be between 12 and 18 based on the customary age at the time for girls to be married. The Bible does not mention her age, so it is purely speculative.
Roman citizens did not pay income tax during the time of Jesus. Instead, taxes were collected through various means such as tolls, customs duties, and land taxes. The most infamous tax was the census tax, which required citizens to register their property and pay a head tax.
The SI unit for time is seconds (s).
It is difficult to come to an accurate answer as exact values are not available. It is said that a daily wage in the time of Jesus for the Roman soldier was one denarius or roughly 15 cents. A talent was worth over 10,000 denarium or 3,000 shekels. A handsome amount by any standard - see related link below:
In Jesus time you bet that was a lot of money for an ordinary person.
Seconds
There can only be one garnishment against your wages at a time.
The unit of time in both the SI and the "customary" systemsis the second.