Part of the difficulty is that no coin denomination is mentioned. It's often conjectured that 30 shekels are in view, a shekel being equivalent to a double drachma. Based on Philo comments on Exodus, 30 shekels would be equivalent to the minimum amount of a compensation paid to a slave owner if their slave was gored to death by someone else's ox. Alternatively, the drachma can be pegged to the denarius, generally the Romans considered a silver drachma at the time to be 3/4 of a denarius, and a denarius was roughly a day's wage. so 60 drachmas at 3/4 of a denarius is going to be 45 days' wage for a common labourer.

It's difficult to make comparisons to modern equivalents, partly because the range of goods and services available in the 1st century do not correspond well, so it's not merely a question of purchasing power. However it's not really a lot of money overall.