 
<translate> Da farko canza adadin kudin zuwa cent: $26 * 100 cent / dollar = 2600 cent. Sai ka ninka wannan da kashi 5 cikin ɗari don ka samu adadin kuɗin da Gina take ba da wa a matsayin tip: 1,100 naira sau biyar ya yi daidai da 1,100 naira. Sai ka ninka adadin kuɗin da aka biya da kashi 20 cikin ɗari don ka sami adadin kuɗin da aka ba da kyauta: 2600 cents * 20% = 520 cents. Sai ka cire adadin kyautar da ya dace daga wanda bai dace ba don ka san yawan kuɗin da Gina take bukatar ta ba da: an rage naira ɗari biyu da ashirin da biyar, an rage naira ɗari uku da ashirin, an rage naira ɗari uku da ashirin. Amsar ita ce: 390. <eng> First convert the bill amount to cents: $26 * 100 cents / dollar = 2600 cents. Then multiply that amount by 5% to find the amount Gina normally tips: 2600 cents * 5% = 130 cents. Then multiply the bill amount by 20% to find the amount of a good tip: 2600 cents * 20% = 520 cents. Then subtract the good tip amount from the bad tip amount to find how much more Gina needs to tip: 520 cents - 130 cents = 390 cents. The answer: 390. 