Let’s work on questions 21-20 from the 2015 First-Class Constructor Examination, related to \"Engineering Economics\": multiple-choice questions 13-14

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I have gathered some questions from this year’s first-level constructor exam, along with their answers. I’m sharing them here to increase everyone’s interest in participating. Instead of posting them all at once, I’ll present a few multiple-choice questions or one case study at a time, with the answers hidden. The answer will be visible after responding. Everyone is welcome to participate; the moderator will give rewards to those who give correct answers. ****************************************** 13. According to the \"Construction Project Contract (Model Text)\" (GF-2013-0201), when the contractor purchases materials and construction equipment, the contract specifies the range of price fluctuations allowed for major materials and construction equipment. A. 10% B. 5% C. 4% D. 3% 【Answer】B 【Expert Explanation】Refer to page 259 of the textbook. When the contractor purchases materials and construction equipment, the contract should specify the range or percentage of variation allowed for the prices of these materials and equipment. If no such specification is provided, and the unit price of the materials or equipment changes by more than 5%, the excess amount should be adjusted using either the price index method or the cost information differential adjustment method. 14. In accordance with the \"Code for Valuation of Construction Projects based on Bill of Quantities\" (GB50500-2013), if there is no applicable item or a similar item in the priced bill of quantities for the changed project, the unit price for such changed project shall be determined by the party that proposes it. A. Contractor B. Supervisor C. Client D. Designer 【Reference Answer】A