 
 <translate> In the second hour, the number of towels given out is 50 x 1.20 = 60. In the third hour, the number of towels given out is 60 x 1.25 = 75. In the fourth hour, one - third of the guests of the third hour is 75 / 3 = 25. In the fourth hour, the number of towels given out is 75 + 25 = 100. In total, including the first hour guests, they need to wash this many towels: 50 + 60 + 75 + 100 = 285.
Therefore, the answer is 285. <hau> A sa'a ta biyu, adadin tawul din da aka bayar ya kai 50 x 1.20 = 60. A sa'a ta uku, yawan tawul din da aka bayar ya kai 60 x 1.25 = 75. A cikin sa'a ta huɗu, kashi ɗaya bisa uku na baƙi na sa'a ta uku shine 75 / 3 = 25. A sa'a ta huɗu, adadin tawul ɗin da aka rarraba shi ne 75 + 25 = 100. Gabaɗaya, haɗe da baƙi na sa'a ta farko, suna bukatar wanke tawul ɗin nan da yawa: 50 + 60 + 75 + 100 = 285. Saboda haka, amsar ita ce 285. 