A Planned Motorway Connecting Two Cities Was Originally Expected to Cost

Multiple Choice

A planned motorway connecting two cities was originally expected to cost £200 million. After building part of the system at a cost of £150 million, the government realised that the total cost of the system would be £260 million rather than £200 million. At this point, the marginal cost of completing the motorway is best estimated as

A) £260 million.
B) £60 million.
C) £110 million.
D) £50 million.