Calculate marginal revenue from a vector of prices going from $10 to $40 in $1 increments (use the same defaults for the other variables) and answer the following:
| price | MR |
| $10 | -$29.82 |
| $11 | -$27.82 |
| $12 | -$25.82 |
| $13 | -$23.82 |
| $14 | -$21.82 |
| $15 | -$19.82 |
| $16 | -$17.82 |
| $17 | -$15.82 |
| $18 | -$13.82 |
| $19 | -$11.82 |
| $20 | -$9.82 |
| $21 | -$7.82 |
| $22 | -$5.82 |
| $23 | -$3.82 |
| $24 | -$1.82 |
| $25 | $0.18 |
| $26 | $2.18 |
| $27 | $4.18 |
| $28 | $6.18 |
| $29 | $8.18 |
| $30 | $10.18 |
| $31 | $12.18 |
| $32 | $14.18 |
| $33 | $16.18 |
| $34 | $18.18 |
| $35 | $20.18 |
| $36 | $22.18 |
| $37 | $24.18 |
| $38 | $26.18 |
| $39 | $28.18 |
| $40 | $30.18 |