Island Vista had a January $1$ beginning balance in its Prepaid Rent account of $ $1$ comma $900$$$1,900.$ During the year the company made payments for prepaid rent of $ $600$$$600.$ At the end of the$$ year, December$31,$ the balance in the Prepaid Rent account was $ $1$ comma $500$$$1,500.$ What was the amount of rent expense for the$$ year?