Sentence Correction

experts please comment whether, on the basis of redundant comparison, a) to d) are INCORRECT and e) is correct
a) compared to GMAT, GRE is much easier
b) This year's interest rate is four times compared to last year's
c) John is better coder compared to me
d) Stanford's average gmat is higher compared to Harvard's
e) The employment rate in country X is 4%, compared to 2% in country Y

also, please see attached picture from one of ron's session. i didn't get what he explained. it seems that he is saying that sentence in black is wrong and the one in grey is correct but i did not get the reason. can experts help me understand that

vikram4689 wrote:experts please comment whether, on the basis of redundant comparison, a) to d) are INCORRECT and e) is correct
a) compared to GMAT, GRE is much easier
b) This year's interest rate is four times compared to last year's
c) John is better coder compared to me
d) Stanford's average gmat is higher compared to Harvard's
e) The employment rate in country X is 4%, compared to 2% in country Y

You cant use two comparison structure at the same time :

refer this MGMAT question : https://www.beatthegmat.com/hello-alliga ... 14555.html

hope this helps !!

thanks avik, i think some point is missing because following 2 sentences that you mentioned are not equivalent in meaning
1)compared to alligators, crocodile are able to ... means alligators are *NOT* able
2)crocodiles are better able than alligators ... confirm to original meaning

actually this is what prompted me to start this thread and the reason that i posted the picture above. see the sentence in picture to which ron says "this sentence does not compare anything". that means every instance of double comparison may not be easily resolvable into 2 different correct sentences that retain the original meaning

experts please help me in resolving above query