President Muhammadu Buhari since assuming office in May 2015 has travelled to many countries in search of economic relations and also attracting foreign investors into the country in order to boost the economy.
Recently, the President has sojourned to China for one week official assignment leaving the 2016 Budget unsigned.
Listed below are the countries the president has visited so far:
1) Niger Republic (May 2015)
2) CHAD (June 2015)
3) Germany (June 2015)
4) South Africa (June 2015)
5) United Kingdom (May 2015)
6) USA (July 2015)
7) Cameroon (July 2015)
Benin Republic (August 2015)
9) France (September 2015)
10) Ghana (September 2015)
11) India (October 2015)
12) Sudan (October 2015)
13) Iran (November 2015)
14) France (November 2015)
15) Malta (November 2015)
16) USA (November 2015)

17) South Africa (December 2015)
18) Benin Rep. (December 2015)
19) UAE (January 2016)
20) Kenya (January 2016)
21) Ethiopia (January 2016)
22) France (February 2016)
23) United Kingdom (February 2016)
24) Egypt (February 2016)
25) Saudi Arabia (February 2016)
26) Qatar (February 2016)
27) China

Source: www.canicechinedu..com

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I suggest you do a study of bilateral agreements signed during such visits and the relevance or otherwise of such agreements. That is the way we can conclude that his trips are wasteful or rewarding.