Malika charges $7.60 per hour for babysitting. She babysits 6 hours each week. She spends $11 per week and puts the rest of her earnings in a savings account. After 12 weeks, Malika's grandparents put a gift of money in her savings account that is equal to 0.25 times the amount she has saved from her babysitting earnings.How much money does Malika have in her savings account after the gift from her grandparents?

Step-by-step explanation:

First you have to figure out what she puts into her savings account each week, then multiply it by 12.  Per week:

7.60(6) - 11 = $34.60 per week goes into savings.

12($34.60) = $415.20 after 12 weeks.

If her grandparents are putting in .25 times the amount she already has, and the amount she already has is 415.20, then her grandparents are putting in 100% of that 415.20 plus another 25%, so 125% of $415.20:

1.25(415.20) = $519.00

That's the amount she will have after her grandparents' gift.

Step-by-step explanation:

Malika charges $7.60 per hour for babysitting. She babysits 6 hours each week. This means that the amount she earns in a week is

7.6 × 6 = $45.6

If she spends $11 per week, then the amount that she puts in her savings account each week is

45.6 - 11 = $34.6

In 12 weeks, the amount that she would have save is

12 × 34.6 = $415.2

If after 12 weeks, Malika's grandparents put a gift of money in her savings account that is equal to 0.25 times the amount she has saved from her babysitting earnings, it means that the amount that they put is

0.25 × 415.2 = 103.8

Therefore, the total amount that Malika has in her savings account after the gift from her grandparents is

103.8 + 415.2 = $519

2cm

Step-by-step explanation:

The volume of water displaced by the rod is

v = πr^2 h = π * 3^2 * 8 = 72π cm^3

The drop in water level is the rod volume divided by the cross-section area of the tin, or

72π/(π*6^2) = 2 cm