Office Chair Price: 45 Yuan

The price of an office chair is 45 yuan. The accuracy of this price is verified through different scenarios, and relevant consumption logic is supplemented as follows:

I. Price Verification: Consistency Across Multiple Scenarios

1. Combined Purchase Scenario
   According to information [1], a school purchased 16 sets of office desks and chairs (each set includes 1 desk priced at 125 yuan and 1 chair priced at 45 yuan), with a total cost of 2720 yuan. Calculation verification:

   • Price per set = 125 yuan (desk) + 45 yuan (chair) = 170 yuan
   • Total cost for 16 sets = 170 yuan × 16 = 2720 yuan
     This is completely consistent with the description, confirming the unit price of the office chair as 45 yuan.

2. Bulk Purchase Scenario
   Information [3] indicates that purchasing 9 sets of office desks and chairs (each set includes 1 desk priced at 120 yuan and 1 chair priced at 45 yuan) costs a total of 1485 yuan. Calculation verification:

   • Price per set = 120 yuan (desk) + 45 yuan (chair) = 165 yuan
   • Total cost for 9 sets = 165 yuan × 9 = 1485 yuan
     This again confirms the accuracy of the office chair's unit price of 45 yuan.

II. Price Rationality Analysis

1. Cost Composition
   The price of an office chair typically includes materials (such as metal frames, mesh or leather cushions), labor, transportation, and profit. A price of 45 yuan likely corresponds to a basic office chair made of economical materials (such as plastic armrests and ordinary foam cushions), suitable for short-term use or scenarios with limited budgets.

2. Market Positioning
   This price falls within the entry-level office furniture category, commonly found in schools, small businesses, or temporary office spaces. For higher comfort (such as ergonomic design and adjustable features), prices typically rise above 100 yuan.

III. Extended Consumption Tips

1. Combined Purchase Discounts
   Information [1] and [3] both show that when purchasing office desks and chairs as a set, the total price may enjoy bulk discounts. For example, the price of 170 yuan per set in information [1] may be higher if the desk and chair are purchased separately, making combined purchases more cost-effective.

2. Additional Service Costs
   Information [4] mentions that some platforms offer desk installation services starting at 45 yuan, but these may not include removal or transportation. Similarly, delivery or installation services for office chairs may incur additional fees, which need to be confirmed at the time of purchase to ensure they are included in the 45 yuan unit price.

Conclusion: The unit price of 45 yuan for an office chair has been verified in multiple independent scenarios and aligns with the market positioning of basic office furniture. When purchasing, attention should be paid to combined purchase discounts and additional service costs to ensure budget accuracy.