Performance of all-solid-state device developed by Chinese researchers akin to that of advanced varieties, findings published in Nature Communications say.
“Technology developed in other countries taken credit for by a Chinese company that has a nonviable product promised to eventually be the best, according to imaginary numbers.”
50/200 is 25%, not 4%. Let’s fix this title:
“Technology developed in other countries taken credit for by a Chinese company that has a nonviable product promised to eventually be the best, according to imaginary numbers.”
Literally the first paragraph of the article explains that it is 4% of the cost:
You seem to be confusing the cost of materials with the overall cost of production.