ABC LLC collected advertising data for its three products. For example, when ABC decided to spend 3 mn dollars for product A, it achieved a sales of 208 mn dollars. When they spend the same amount for product B, the revenue for Product B was 181 mn dollars.

Based on the data below,

• What is the shape of the sales response curve for each of the products
• Given a choice, to spend 20 mn dollars on advertising any one product, which one would you choose and why? 

Advertising Spend Sales (mn (mn Dollars) dollars) 8 8.3 16 10.2 4.5 11 5 5.6 4 12.2 7 Product A 3 222 223 244 228 212 230 213 215 211 234 219 208 Product B Sales (mn) dollars) 191 192 208 196 184 198 185 186 183 200 189 181 Product C Sales (mn) dollars) 506 506 512 508 503 508 504 504 503 509 505 502