Well first you should know that 4/10 is simplified to 2/5 so that part is correct But to know of the rest is correct , add the Fractions so the common denominator will be 8 so 1/2 will become 4/8 + 3/8 = 7/8 but 7/8 does not equal 4/10
70-80=10 hope this help the 68 rounded to the nearest tenth equals 70 and 76 rounded to the nearest tenth equals 80 so if you subtract 80-70=10 Tito increased the percent up to 10 dollars
