(NewsNation) — Sending two kids to day care is about 40 percent more expensive than rent across the nation's 100 largest metros, according to a new study from LendingTree. The analysis determined that the average monthly cost of full-time center-based child care for an infant and a 4-year-old is $2,182. That's 39.4 percent higher than the average rent for a two-bedroom unit, which is $1,566. In some cities, families can expect to pay more than d…