Question 1024534
Salesi saves a total of $1 530 over 20 weeks.
 In the first week he saved $10. He increased his savings by the same amount each week.
 Find the amount that Salesi increased his savings by each week.
:
I could not come up with a formula for this, wrote a small basic program and it came up with this.
:
 20 payments increased by $7.06 each payment to accumulate $1531.4
Payment number, payment amt, accumulated amt
              1,              10,            0
              2,             17.06,          17.06
              3,             24.12,         41.18
              4,             31.18,         72.36
              5,             38.24,         110.6
              6,             45.3,          155.9
              7,             52.36,         208.26
              8,             59.42,         267.68
              9,            66.48,         334.16
              10,            73.54,         407.7
              11,            80.6,          488.3
              12,            87.66,         575.96
              13,            94.72,         670.68
              14,            101.78,       772.46
              15,            108.84,        881.3
              16,            115.9,         997.2
              17,            122.96,       1120.16
              18,            130.02,        1250.18
              19,            137.08,        1387.26
              20,            144.14,        1531.4