💡 Detailed Explanation
The correct sentence order is: '安くて 性能が(0) いい(1) ★パソコンを(2) 買おうと(3) 思います。' (I think I will buy a computer that is cheap and has good performance). Grammatical breakdown: '安くて' and '性能がいい' (good performance) both modify the noun 'パソコンを' (computer [direct object]). '[Verb Volitional Form] + と思う' expresses an intention ('買おうと思います' - I think I will buy). The third position (★) is filled by 'パソコンを' (Choice 'パソコンを').