$][$TLB Effective Access Time$]$ Assume a system has a TLB hit ratio of $90\%.$ When a TLB hit occurs, it takes $210$ nanoseconds to access a desired instruction or data in memory. In case of a TLB miss, the access time to a desired instruction or data in memory becomes $410$ nanoseconds. If we assume the TLB access time is $10$ nanoseconds, $1)$ what is the memory access time? $2)$ Additionally, what is the effective memory access time in nanoseconds for this system?