APT Accounting and tax consultancy provide various services, including tax, mortgage, book keeping, audit and personal financial planning. They have examined the behavior of their clients. Based on the experience, they estimate that 10% of their clients seek help for mortgages and 5% for personal financial planning. Of those who seek help for mortgages, 40% also seek help for personal financial planning. a. What percentage of the clients seek help for both mortgages and personal financial planning? b. What percentage of the clients do not seek help for either of these two services