b) Spic& Span Ltd is estimating it's fixed and variable costs. The following costs were incurred in January 2022 when 320 homes were cleaned Cleaning supplies sh 3500 5000 Depreciation (cleaning machine) 800 Hourly Wages Marketer's salary 2000 Insurance 500 Travelling allowance 1800 Rental expense 1000 Required: i) Determine the cost function; ii) If cleaning supplies increased with 10% of the total cost for the month, hourly wages reduced by 10% and fixed costs increased by sh 300, formulate the cost formula if 380 homes were cleaned