Suppose that budding economist Buck measures the inverse demand curve

Suppose that budding economist Buck measures the inverse demand curve for toffee as P = $100 - QD , and the inverse supply curve as P = QS . Buck's economist friend Penny likes to measure everything in cents. She measures the inverse demand for toffee as P = 10,000 - 100QD, and the inverse supply curve as P = 100QS.
a. Find the slope of the inverse demand curve, and compute the price elasticity of demand at the market equilibrium using Buck's measurements.
b. Find the slope of the inverse demand curve, and compute the price elasticity of demand at the market equilibrium using Penny's measurements. Is the slope the same as Buck calculated? How about the price elasticity of demand?