$1.)$ Uncertainty as to whether or not the full amount of the selling price will be received: The company can use the installment method or the cost recovery method. The installment method recognizes gross profit to the proportion of cash received divided by the amount originally owed.

WHAT then is the installment method

WHAT then is the cost recovery method

$2.)$ Right of return exists: Revenue cannot be recognized at the point of delivery unless the company can reasonably estimate the future returns. $--->$ So what does this mean, how do we calculate$/$determine$.$