All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.
The actu science is a science on which many insurance companies, banks, factories and the like, depend, and it has become an important science because of the great number of financial complications at this time and age. With this in mind, learning it and practicing it is permissible. However, if someone learns this science, then it is not permissible for him to use it in the service of usurious transactions in interest-based banks or commercial insurance companies and similar fields that are not permissible to promote and support.
Allah knows best.