please tell me if i have solved these correctly

Question

question: Consider a paging system with the page table stored in memory. 1)If a memory reference takes 50 nanoseconds, how long does a paged memory reference take? answer=2x50=100ns
2). If we add TABs, and 75 percent of all page-table references are found in the TLBs, what is the effective memory reference time? (Assume that finding a page-table entry in the TLBs takes 2 nanoseconds, if the entry is present.)answer=75%*50+25%+10