For this task, you need to show all your calculations, step by step. a) Tony received an electricity bill for 445 last month. The bill includes a fixed monthly charge of 75 and the cost per unit is 40 pence. Calculate to the nearest whole number, the quantity of units he has used. b) The financial report of Zebra Company stated: Net profit of 325,750 for the year 2022 (an increase of 7% ). What was the value of Net profit in the previous year? (show to the nearest whole number) c) A landlord currently receives $600 monthly rental payments from an existing tenant. The rental is increased by 5% per month. What is the total annual rental received after the increase? (show all workings) d) A laptop was advertised for sale at f1,400, which was only 80% of original price. What was the original price before the discount? (show all workings)