In other words, you pay 15 yuan every year, and the sum of interest generated by financial subsidies and premiums in the social security fund account is divided by 139. Personal account pension is probably around 230 yuan, because the interest standard will be adjusted, and the specific figures are not counted now.
The regional differences in basic pensions are not small. The current national standard is 55 yuan per person per month, but the financial situation varies from place to place. Where the financial situation is good, the local finance will give some subsidies. Our basic pension standard in Linyi is 75 yuan per person per month.
You can get your monthly income by adding up the above two items.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.