Mirasol saved php 10.00 on the first day of January, php 12.00 on the second day, php 14. 00 onthe thurd day , and so on , up to the last day of the month.How much did mirasol save at the end of January? [solution po]
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QUESTION:
Mirasol saved PHP 10.00 on the first day of January, php 12.00 on the second day, php 14. 00 on Thursday, and so on, up to the last day of the month. How much did mirasol save at the end of January?
SOLUTION:
[sequence]
an = a1 + (n - 1)d
d = 2
a1 = 10
n = 31
a31 = 10 + (31 - 1)2
= 10 + (30)2
= 10 + 60
a31 = 70 -> the amount she saved at the last day of the month
[series]
Sn = n/2 (a1 + an)
S31 = 31/2 (10 + 70)
= 31(80)/2
= 2480/2
ANSWER:
S31 = 1240 -> the amount she saved for the whole month
solve the letter of the correct answer
Answer:
She earned 136 pesos on the first week so we will mutiply it by 4 because it has 4weeks in a month and after that we add the answer and add 46 for the 3 days left becase month of january has 31 days...
And the final answer is she earned 590 pesos on the month of january..
HOPE it helps