Requirement 3. polar bear lost its lease and had to move to another building. monthly rent for the new building is $ 3 comma 300. at the suggestion of parents, polar bear plans to take children on field trips. monthly costs of the field trips are $ 2 comma 500. by how much should polar bear increase fees per child to meet the target operating income of $ 10 comma 800 per month, assuming the same number of children as in requirement 2? determine the formula used to calculate the fee increase per child, then enter the amounts to calculate the increase needed to meet the target operating income.