Answer: If she rented, the cost is $800 per month, and the utilities are $150 per month.
In the other hand, if she buys, the monthly cost is $1000 in the mortgage payment and $200 in utilities, here you can see that, per month, renting is a lot cheaper (which has a lot of sense)
But the advantage of buying rather than renting is that if Sasha buys, in the end, Sasha will have a house or condo, which is a more efficient investment in the long run.