SISAL productions has in the past produced just one fairly successful product. Recently, however, a new version of this product has been launched. Development work continues to add a related product to the product list. Given below are some details of the activities during the month of November. Units produced Existing product $25,000$ New product $5,000$ Costs of units produced Existing product TZS $375,000$ New product TZS $70,000$ Sales revenue Existing product TZS $550,000$ New product TZS $125,000$ Hours worked Existing product $5,000$ New product $1,250$ Development costs TZS $47,000$ REQUIRED: a$)$ Suggest and calculate performance indicators that could be calculated for each of the four perspectives on the balanced scorecard. b$)$ Suggest how this information would be interpreted.